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Books on How to Write a Literature Review

By Med Kharbach, PhD | Published: June 18, 2023 | Updated: February 18, 2024

Books on how to write a literature review

Working on a literature review can feel like venturing into an intricate maze—there’s methodology, grey literature, style formatting guidelines, and so much more to master. That’s why I’ve curated a list of essential reads that serve as your personal map through this labyrinth. Whether you’re just dipping your toes into the concept or you’ve been crafting literature reviews for years, these books offer invaluable insights to make your work comprehensive a\nd impactful.

For those of you scratching your heads thinking, “ What even is a literature review ?”—don’t sweat it. Take a quick detour to my earlier post, “What is a Literature Review,” to get the 411. Trust me, once you’ve got the basics down, these books will help you elevate your game to the next level.

Here is our collection of some very good books on how to write a literature review

1.  Published , by Thomas Deetjen

Published: a guide to literature review

“Published” is a comprehensive guide that organizes the research process into seven clear phases, offering step-by-step instruction for each. The book is designed to take you through your research journey from the beginning to the end. It provides the clarity, direction, and encouragement you need to drive your project from the inception to the ultimate goal – publication.

2. Doing a Literature Review , by Chris Hart

Doing a Literature Review

“Doing a Literature Review” is a guide that illuminates the “what,” “how,” and “why” of literature reviewing. The book covers the literature review process from start to finish, introduces new chapters explaining different types of reviews and evidence evaluation, and offers extended examples for the application of key techniques and procedures.

The book couples a critical, philosophical approach with a selection of practical examples, equipping readers with both the intellectual understanding and the technical skills needed to produce high-quality literature reviews.

3. Doing a Systematic Review: A Student’s Guide , by Angela Boland (Editor), Gemma Cherry (Editor), Rumona Dickson (Editor)

Doing a Systematic Review

“Doing a Systematic Review: A Student’s Guide” is a friendly, accessible manual from an expert team of authors with extensive experience in conducting and supervising systematic reviews.

The guide provides clear answers to all review-related questions, including formulating an appropriate review question, managing the review, developing a search strategy, getting started with data extraction, assessing the quality of a study, analyzing and synthesizing data, and writing up the discussion and conclusion sections of a dissertation or thesis.

4. An Introduction to Systematic Reviews , by David Gough  (Editor), Sandy Oliver (Editor), James Thomas (Editor)

An Introduction to Systematic Reviews

“An Introduction to Systematic Reviews” is a hands-on guide that focuses on using systematic review as a research method. The book provides clear, step-by-step advice on the logic and processes of systematic reviewing, emphasizing the importance of precision and accuracy.

The second edition introduces a new chapter on statistical synthesis and innovative approaches to research synthesis, including text mining, living reviews, and qualitative comparative analysis in mixed methods reviews.

The book is filled with examples from across the social sciences, making it an invaluable resource for students and researchers seeking to turn systematic reviews into policy recommendations.

5. Introduction to Meta-Analysis , by Michael Borenstein, Larry V. Hedges, Julian P. T. Higgins, Hannah R. Rothstein 

Introduction to Meta-Analysis

“Introduction to Meta-Analysis” is written by four of the world’s leading authorities on meta-analysis. The updated edition presents an outline of meta-analysis in the research process, demonstrates how to compute effect sizes and treatment effects, and explains the fixed-effect and random-effects models for synthesizing data.

The book also helps in assessing and interpreting variation in effect size across studies, avoiding common mistakes in meta-analysis, and discussing controversies in meta-analysis. The book includes access to a companion website that provides step-by-step instructions for performing analyses using Comprehensive Meta-Analysis (CMA), along with additional resources.

6. Systematic Approaches to a Successful Literature Review , by Andrew Booth, Anthea Sutton, Mark Clowes, Marrissa Martyn-St James

Systematic Approaches to a Successful Literature Review

This book is a practical guide to conducting literature reviews, offering step-by-step processes that work with any data. “Systematic Approaches to a Successful Literature Review” includes worksheets and decision aids to help plan and organize your literature review, worked examples and case studies for practical understanding, troubleshooting tips, and answers to frequently asked questions.

This edition also includes a new chapter on analyzing mixed methods research and provides online access to a literature review starter template, an exercise workbook, project diary template, and a source credibility checklist.

7. Conducting Research Literature Reviews: From the Internet to Paper , by Arlene G. Fink

Conducting Research Literature Reviews

Arlene G. Fink’s “Conducting Research Literature Reviews: From the Internet to Paper” provides an in-depth, accessible guide on how to synthesize research literature. It is an ideal resource for students, researchers, marketers, planners, and policymakers who are involved in designing and managing public and private agencies, conducting research studies, and preparing strategic plans and grant proposals.

The Fifth Edition of the book features new research, examples, and references from the social, behavioral, and health sciences, expanded coverage of qualitative research, updated and revised meta-analysis procedures, a new glossary of key terms, double the number of exercises, and additional examples of how to write reviews.

8. Systematic Reviews in Educational Research: Methodology, Perspectives and Application , by Olaf Zawacki-Richter et al 

Systematic Reviews in Educational Research

This open access edited volume brings together international researchers in the field of education to describe and discuss the systematic review method as it applies to research in education. Alongside fundamental methodical considerations, reflections and practical examples are provided, offering an introduction and comprehensive overview of systematic reviews in educational research.

9. Searching the Grey Literature: A Handbook for Searching Reports, Working Papers, and Other Unpublished Research , by Sarah Bonato

Searching the Grey Literature

“Searching the Grey Literature is an invaluable guide for researchers interested in expanding their knowledge about grey literature. Whether you’re faced with your first grey literature search request or you’re an experienced searcher finding that your patrons are unfamiliar with this vast body of literature, this book can help.

Providing effective strategies for crafting successful searches and teaching about the importance of grey literature, it is an important resource for librarians and other information professionals.

10. Publication Manual (OFFICIAL) 7th Edition of the American Psychological Association , by American Psychological Association

Publication Manual (OFFICIAL) 7th Edition of the American Psychological Association

“The Publication Manual of the American Psychological Association, Seventh Edition is the official source for APA Style. With millions of copies sold worldwide in multiple languages, it is the style manual of choice for writers, researchers, editors, students, and educators in the social and behavioral sciences, natural sciences, nursing, communications, education, business, engineering, and other fields.

Known for its authoritative, easy-to-use reference and citation system, the Publication Manual also offers guidance on choosing the headings, tables, figures, language, and tone that will result in powerful, concise, and elegant scholarly communication. It guides users through the scholarly writing process—from the ethics of authorship to reporting research through publication.”

11. The Literature Review: Six Steps to Success , by Lawrence A. Machi, Brenda T. McEvoy

The Literature Review

“From daunting to doable in six steps, this book presents the process of literature review in a clear and straightforward manner. The authors walk students through every step of the process, including selecting a topic, searching the literature, developing arguments, surveying the literature, critiquing the literature, and writing the literature review.”

Final thoughts

As we round out this exploration of must-reads for crafting literature reviews, I can’t help but reflect on the transformative power of a well-executed review. It’s not just an academic exercise; it’s a meaningful contribution to your field, a way of synthesizing knowledge and creating a foundation for future research. Besides providing you with the “how-to”, these books delve into the nuances and complexities that make your review truly resonate.

I’ve personally found immense value in these resources, both in my days asa a doctoral student and in my current research work. The methodologies, guidelines, and tips covered are like an insider’s guide to academic writing. Whether you’re a newbie or a seasoned pro, having a collection of solid guidebooks can make the difference between a literature review that’s just okay and one that sets the gold standard.

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books on literature review

Meet Med Kharbach, PhD

Dr. Med Kharbach is an influential voice in the global educational landscape, with an extensive background in educational studies and a decade-long experience as a K-12 teacher. Holding a Ph.D. from Mount Saint Vincent University in Halifax, Canada, he brings a unique perspective to the educational world by integrating his profound academic knowledge with his hands-on teaching experience. Dr. Kharbach's academic pursuits encompass curriculum studies, discourse analysis, language learning/teaching, language and identity, emerging literacies, educational technology, and research methodologies. His work has been presented at numerous national and international conferences and published in various esteemed academic journals.

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  • Knowledge Base

Methodology

  • How to Write a Literature Review | Guide, Examples, & Templates

How to Write a Literature Review | Guide, Examples, & Templates

Published on January 2, 2023 by Shona McCombes . Revised on September 11, 2023.

What is a literature review? A literature review is a survey of scholarly sources on a specific topic. It provides an overview of current knowledge, allowing you to identify relevant theories, methods, and gaps in the existing research that you can later apply to your paper, thesis, or dissertation topic .

There are five key steps to writing a literature review:

  • Search for relevant literature
  • Evaluate sources
  • Identify themes, debates, and gaps
  • Outline the structure
  • Write your literature review

A good literature review doesn’t just summarize sources—it analyzes, synthesizes , and critically evaluates to give a clear picture of the state of knowledge on the subject.

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Table of contents

What is the purpose of a literature review, examples of literature reviews, step 1 – search for relevant literature, step 2 – evaluate and select sources, step 3 – identify themes, debates, and gaps, step 4 – outline your literature review’s structure, step 5 – write your literature review, free lecture slides, other interesting articles, frequently asked questions, introduction.

  • Quick Run-through
  • Step 1 & 2

When you write a thesis , dissertation , or research paper , you will likely have to conduct a literature review to situate your research within existing knowledge. The literature review gives you a chance to:

  • Demonstrate your familiarity with the topic and its scholarly context
  • Develop a theoretical framework and methodology for your research
  • Position your work in relation to other researchers and theorists
  • Show how your research addresses a gap or contributes to a debate
  • Evaluate the current state of research and demonstrate your knowledge of the scholarly debates around your topic.

Writing literature reviews is a particularly important skill if you want to apply for graduate school or pursue a career in research. We’ve written a step-by-step guide that you can follow below.

Literature review guide

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Writing literature reviews can be quite challenging! A good starting point could be to look at some examples, depending on what kind of literature review you’d like to write.

  • Example literature review #1: “Why Do People Migrate? A Review of the Theoretical Literature” ( Theoretical literature review about the development of economic migration theory from the 1950s to today.)
  • Example literature review #2: “Literature review as a research methodology: An overview and guidelines” ( Methodological literature review about interdisciplinary knowledge acquisition and production.)
  • Example literature review #3: “The Use of Technology in English Language Learning: A Literature Review” ( Thematic literature review about the effects of technology on language acquisition.)
  • Example literature review #4: “Learners’ Listening Comprehension Difficulties in English Language Learning: A Literature Review” ( Chronological literature review about how the concept of listening skills has changed over time.)

You can also check out our templates with literature review examples and sample outlines at the links below.

Download Word doc Download Google doc

Before you begin searching for literature, you need a clearly defined topic .

If you are writing the literature review section of a dissertation or research paper, you will search for literature related to your research problem and questions .

Make a list of keywords

Start by creating a list of keywords related to your research question. Include each of the key concepts or variables you’re interested in, and list any synonyms and related terms. You can add to this list as you discover new keywords in the process of your literature search.

  • Social media, Facebook, Instagram, Twitter, Snapchat, TikTok
  • Body image, self-perception, self-esteem, mental health
  • Generation Z, teenagers, adolescents, youth

Search for relevant sources

Use your keywords to begin searching for sources. Some useful databases to search for journals and articles include:

  • Your university’s library catalogue
  • Google Scholar
  • Project Muse (humanities and social sciences)
  • Medline (life sciences and biomedicine)
  • EconLit (economics)
  • Inspec (physics, engineering and computer science)

You can also use boolean operators to help narrow down your search.

Make sure to read the abstract to find out whether an article is relevant to your question. When you find a useful book or article, you can check the bibliography to find other relevant sources.

You likely won’t be able to read absolutely everything that has been written on your topic, so it will be necessary to evaluate which sources are most relevant to your research question.

For each publication, ask yourself:

  • What question or problem is the author addressing?
  • What are the key concepts and how are they defined?
  • What are the key theories, models, and methods?
  • Does the research use established frameworks or take an innovative approach?
  • What are the results and conclusions of the study?
  • How does the publication relate to other literature in the field? Does it confirm, add to, or challenge established knowledge?
  • What are the strengths and weaknesses of the research?

Make sure the sources you use are credible , and make sure you read any landmark studies and major theories in your field of research.

You can use our template to summarize and evaluate sources you’re thinking about using. Click on either button below to download.

Take notes and cite your sources

As you read, you should also begin the writing process. Take notes that you can later incorporate into the text of your literature review.

It is important to keep track of your sources with citations to avoid plagiarism . It can be helpful to make an annotated bibliography , where you compile full citation information and write a paragraph of summary and analysis for each source. This helps you remember what you read and saves time later in the process.

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To begin organizing your literature review’s argument and structure, be sure you understand the connections and relationships between the sources you’ve read. Based on your reading and notes, you can look for:

  • Trends and patterns (in theory, method or results): do certain approaches become more or less popular over time?
  • Themes: what questions or concepts recur across the literature?
  • Debates, conflicts and contradictions: where do sources disagree?
  • Pivotal publications: are there any influential theories or studies that changed the direction of the field?
  • Gaps: what is missing from the literature? Are there weaknesses that need to be addressed?

This step will help you work out the structure of your literature review and (if applicable) show how your own research will contribute to existing knowledge.

  • Most research has focused on young women.
  • There is an increasing interest in the visual aspects of social media.
  • But there is still a lack of robust research on highly visual platforms like Instagram and Snapchat—this is a gap that you could address in your own research.

There are various approaches to organizing the body of a literature review. Depending on the length of your literature review, you can combine several of these strategies (for example, your overall structure might be thematic, but each theme is discussed chronologically).

Chronological

The simplest approach is to trace the development of the topic over time. However, if you choose this strategy, be careful to avoid simply listing and summarizing sources in order.

Try to analyze patterns, turning points and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred.

If you have found some recurring central themes, you can organize your literature review into subsections that address different aspects of the topic.

For example, if you are reviewing literature about inequalities in migrant health outcomes, key themes might include healthcare policy, language barriers, cultural attitudes, legal status, and economic access.

Methodological

If you draw your sources from different disciplines or fields that use a variety of research methods , you might want to compare the results and conclusions that emerge from different approaches. For example:

  • Look at what results have emerged in qualitative versus quantitative research
  • Discuss how the topic has been approached by empirical versus theoretical scholarship
  • Divide the literature into sociological, historical, and cultural sources

Theoretical

A literature review is often the foundation for a theoretical framework . You can use it to discuss various theories, models, and definitions of key concepts.

You might argue for the relevance of a specific theoretical approach, or combine various theoretical concepts to create a framework for your research.

Like any other academic text , your literature review should have an introduction , a main body, and a conclusion . What you include in each depends on the objective of your literature review.

The introduction should clearly establish the focus and purpose of the literature review.

Depending on the length of your literature review, you might want to divide the body into subsections. You can use a subheading for each theme, time period, or methodological approach.

As you write, you can follow these tips:

  • Summarize and synthesize: give an overview of the main points of each source and combine them into a coherent whole
  • Analyze and interpret: don’t just paraphrase other researchers — add your own interpretations where possible, discussing the significance of findings in relation to the literature as a whole
  • Critically evaluate: mention the strengths and weaknesses of your sources
  • Write in well-structured paragraphs: use transition words and topic sentences to draw connections, comparisons and contrasts

In the conclusion, you should summarize the key findings you have taken from the literature and emphasize their significance.

When you’ve finished writing and revising your literature review, don’t forget to proofread thoroughly before submitting. Not a language expert? Check out Scribbr’s professional proofreading services !

This article has been adapted into lecture slides that you can use to teach your students about writing a literature review.

Scribbr slides are free to use, customize, and distribute for educational purposes.

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If you want to know more about the research process , methodology , research bias , or statistics , make sure to check out some of our other articles with explanations and examples.

  • Sampling methods
  • Simple random sampling
  • Stratified sampling
  • Cluster sampling
  • Likert scales
  • Reproducibility

 Statistics

  • Null hypothesis
  • Statistical power
  • Probability distribution
  • Effect size
  • Poisson distribution

Research bias

  • Optimism bias
  • Cognitive bias
  • Implicit bias
  • Hawthorne effect
  • Anchoring bias
  • Explicit bias

A literature review is a survey of scholarly sources (such as books, journal articles, and theses) related to a specific topic or research question .

It is often written as part of a thesis, dissertation , or research paper , in order to situate your work in relation to existing knowledge.

There are several reasons to conduct a literature review at the beginning of a research project:

  • To familiarize yourself with the current state of knowledge on your topic
  • To ensure that you’re not just repeating what others have already done
  • To identify gaps in knowledge and unresolved problems that your research can address
  • To develop your theoretical framework and methodology
  • To provide an overview of the key findings and debates on the topic

Writing the literature review shows your reader how your work relates to existing research and what new insights it will contribute.

The literature review usually comes near the beginning of your thesis or dissertation . After the introduction , it grounds your research in a scholarly field and leads directly to your theoretical framework or methodology .

A literature review is a survey of credible sources on a topic, often used in dissertations , theses, and research papers . Literature reviews give an overview of knowledge on a subject, helping you identify relevant theories and methods, as well as gaps in existing research. Literature reviews are set up similarly to other  academic texts , with an introduction , a main body, and a conclusion .

An  annotated bibliography is a list of  source references that has a short description (called an annotation ) for each of the sources. It is often assigned as part of the research process for a  paper .  

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Literature Reviews: Books, Tutorials & Examples

  • Library Basics
  • 1. Choose Your Topic
  • How to Find Books
  • Types of Clinical Study Designs
  • Types of Literature
  • 3. Search the Literature
  • 4. Read & Analyze the Literature
  • 5. Write the Review
  • Keeping Track of Information
  • Style Guides
  • Books, Tutorials & Examples

Find Books and More

books on literature review

"How To" Books @ the GSU Library

books on literature review

Tutorials/How To's

  • How to Write a Literature Review (UCSC)
  • Literature Reviews (UNC Chapel Hill)
  • The Literature Review: A Few Tips On Conducting It (Univ. Toronto)
  • Research Methods Knowledge Base - Writing It Up
  • Review of Literature (UW-Madison)
  • Sample APA Papers: Literature Review (OWL-Purdue)
  • Social Work Literature Review Guidelines
  • A typology of reviews: An analysis of 14 review types and associated methodologies.
  • Undertaking a Literature Review: A step-by-step approach.
  • Writing for College.ORG
  • Writing narrative literature reviews for peer-reviewed journals: Secrets of the trade.
  • Writing a Short Literature Review

Research Logs

  • Evidence Analysis Log You can use this log to help analyze individual citations.
  • Literature Search Tracking Log You can use this log to keep track of your search strategies.

Feel free to modify these Excel files to suit your needs.

  • Writing a Literature Review in the Sciences
  • How to Write a Literature Review in the Health and Social Sciences
  • Critical Thinking and Transferability: A Review of the Literature
  • Entrepreneurship and Ethics: A Literature Review
  • Fourteen Reasons Privacy Matters: A Multidisciplinary Review of Scholarly Literature
  • Home-School Connections: A Review of the Literature
  • The Impact of Regular Self-weighing on Weight Management: A Systematic Literature Review
  • Integrated Delivery of Health Services During Outreach Visits: A Literature Review of Program Experience Through a Routine Immunization Lens
  • Paternal Fears of Childbirth: A Literature Review
  • Product Development Decisions: A Review of the Literature
  • Public Health Emergency Preparedness and Response Communications with Health Care Providers: A Literature Review
  • Research Methods Knowledge Base - Sample Paper
  • Towards pervasive computing in health care – A literature review
  • << Previous: Style Guides
  • Last Updated: Dec 29, 2023 11:41 AM
  • URL: https://research.library.gsu.edu/litrev

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The Literature Review: A Step-by-Step Guide for Students (SAGE Study Skills Series)

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  • Publisher SAGE Publications Ltd
  • Publication date March 3, 2008
  • Language English
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  • ASIN ‏ : ‎ 1412934265
  • Publisher ‏ : ‎ SAGE Publications Ltd; 1st edition (March 3, 2008)
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The Literature Review

The Literature Review Six Steps to Success

  • Lawrence A. Machi - University of La Verne, USA
  • Brenda T. McEvoy - Independent Writer/ Researcher
  • Description

The essential guide—updated, expanded, and easier to use than ever.

Creating a successful literature review can be a daunting task, which is why so many researchers have relied on previous editions of this book to make the process more manageable. Using the six-step model, you’ll work seamlessly to narrow your research topic, focus your literature search, negotiate the myriad of books, periodicals, and reports about your topic—and, of course, write the review.

Updated, expanded, and reorganized to improve ease of use, the fourth edition of this bestselling handbook includes:

  • New and improved graphics ideal for visualizing the process
  • More explanations and tips, especially for writing in the early stages
  • An expanded range of learning tools
  • Additional reflection sections to direct metacognitive activities
  • Four new reference supplements

This pioneering book has provided countless graduate students and researchers with a road map to success. Its model takes you through the logical progression needed for producing a quality literature review—while taking the mystery out of the process.

See what’s new to this edition by selecting the Features tab on this page. Should you need additional information or have questions regarding the HEOA information provided for this title, including what is new to this edition, please email [email protected] . Please include your name, contact information, and the name of the title for which you would like more information. For information on the HEOA, please go to http://ed.gov/policy/highered/leg/hea08/index.html .

For assistance with your order: Please email us at [email protected] or connect with your SAGE representative.

SAGE 2455 Teller Road Thousand Oaks, CA 91320 www.sagepub.com

This book is clearly outlined with easy-to-understand steps supported by wonderful visuals. The key vocabulary, tips section, and checklist all provide tremendous support to any reader wanting to take the needed steps to write a meaningful literature review. This book provides sections that are concise and to the point, making it very easy for readers to skim and refer back to as needed. I commend the authors for presenting such a complex task with so much simplicity. The exercises provided are a great resource for the reader, as well as to a professor who wants to use this book as a text and assign the exercises as class activities . . . I will be sharing this book with colleagues and recommending it to my graduate students. I will also be considering how I can incorporate this book into classes that I teach.

The strengths of The Literature Review include visuals, graphic organizers, checklists, practice activities, chapter structure, and glossary.

Major strengths are the detail and explicitness of the narrative. Everything is spelled out and there are lots of graphics to present a visual support for the content. The book does not skip anything but also does not talk down to the reader.

Clear, thorough, accessible, easy to read with good examples. Love the mapping in Step Three! The authors do an excellent job of discussing ideas, strategies, and tips. Logical, clear, and helpful conclusions are made throughout.

There is a clear framework for critically thinking about and applying a 6-step process for conducting a literature review . . . Unlike any other book, it provides a deep dive examination of how to approach and complete a high-quality literature review via a systematic critical thinking process.

Excellent for all stages of studying

I have recommended this text, particularly for my research project students. This is a brilliant guide for students doing research for the first time.

Used as a text for Research literacy in educational leadership and policy. An excellent resource for learning about literature review.

Very informative but a little too high for the level taught.

More apt for final year and postgrad courses.

Machi &amp; McEvoy do a great job breaking down the literature review. The 4th edition offers some additional exercises, reading strategies, and helpful supplements.

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How To Write A Literature Review - A Complete Guide

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Table of Contents

A literature review is much more than just another section in your research paper. It forms the very foundation of your research. It is a formal piece of writing where you analyze the existing theoretical framework, principles, and assumptions and use that as a base to shape your approach to the research question.

Curating and drafting a solid literature review section not only lends more credibility to your research paper but also makes your research tighter and better focused. But, writing literature reviews is a difficult task. It requires extensive reading, plus you have to consider market trends and technological and political changes, which tend to change in the blink of an eye.

Now streamline your literature review process with the help of SciSpace Copilot. With this AI research assistant, you can efficiently synthesize and analyze a vast amount of information, identify key themes and trends, and uncover gaps in the existing research. Get real-time explanations, summaries, and answers to your questions for the paper you're reviewing, making navigating and understanding the complex literature landscape easier.

Perform Literature reviews using SciSpace Copilot

In this comprehensive guide, we will explore everything from the definition of a literature review, its appropriate length, various types of literature reviews, and how to write one.

What is a literature review?

A literature review is a collation of survey, research, critical evaluation, and assessment of the existing literature in a preferred domain.

Eminent researcher and academic Arlene Fink, in her book Conducting Research Literature Reviews , defines it as the following:

“A literature review surveys books, scholarly articles, and any other sources relevant to a particular issue, area of research, or theory, and by so doing, provides a description, summary, and critical evaluation of these works in relation to the research problem being investigated.

Literature reviews are designed to provide an overview of sources you have explored while researching a particular topic, and to demonstrate to your readers how your research fits within a larger field of study.”

Simply put, a literature review can be defined as a critical discussion of relevant pre-existing research around your research question and carving out a definitive place for your study in the existing body of knowledge. Literature reviews can be presented in multiple ways: a section of an article, the whole research paper itself, or a chapter of your thesis.

A literature review paper

A literature review does function as a summary of sources, but it also allows you to analyze further, interpret, and examine the stated theories, methods, viewpoints, and, of course, the gaps in the existing content.

As an author, you can discuss and interpret the research question and its various aspects and debate your adopted methods to support the claim.

What is the purpose of a literature review?

A literature review is meant to help your readers understand the relevance of your research question and where it fits within the existing body of knowledge. As a researcher, you should use it to set the context, build your argument, and establish the need for your study.

What is the importance of a literature review?

The literature review is a critical part of research papers because it helps you:

  • Gain an in-depth understanding of your research question and the surrounding area
  • Convey that you have a thorough understanding of your research area and are up-to-date with the latest changes and advancements
  • Establish how your research is connected or builds on the existing body of knowledge and how it could contribute to further research
  • Elaborate on the validity and suitability of your theoretical framework and research methodology
  • Identify and highlight gaps and shortcomings in the existing body of knowledge and how things need to change
  • Convey to readers how your study is different or how it contributes to the research area

How long should a literature review be?

Ideally, the literature review should take up 15%-40% of the total length of your manuscript. So, if you have a 10,000-word research paper, the minimum word count could be 1500.

Your literature review format depends heavily on the kind of manuscript you are writing — an entire chapter in case of doctoral theses, a part of the introductory section in a research article, to a full-fledged review article that examines the previously published research on a topic.

Another determining factor is the type of research you are doing. The literature review section tends to be longer for secondary research projects than primary research projects.

What are the different types of literature reviews?

All literature reviews are not the same. There are a variety of possible approaches that you can take. It all depends on the type of research you are pursuing.

Here are the different types of literature reviews:

Argumentative review

It is called an argumentative review when you carefully present literature that only supports or counters a specific argument or premise to establish a viewpoint.

Integrative review

It is a type of literature review focused on building a comprehensive understanding of a topic by combining available theoretical frameworks and empirical evidence.

Methodological review

This approach delves into the ''how'' and the ''what" of the research question —  you cannot look at the outcome in isolation; you should also review the methodology used.

Systematic review

This form consists of an overview of existing evidence pertinent to a clearly formulated research question, which uses pre-specified and standardized methods to identify and critically appraise relevant research and collect, report, and analyze data from the studies included in the review.

Meta-analysis review

Meta-analysis uses statistical methods to summarize the results of independent studies. By combining information from all relevant studies, meta-analysis can provide more precise estimates of the effects than those derived from the individual studies included within a review.

Historical review

Historical literature reviews focus on examining research throughout a period, often starting with the first time an issue, concept, theory, or phenomenon emerged in the literature, then tracing its evolution within the scholarship of a discipline. The purpose is to place research in a historical context to show familiarity with state-of-the-art developments and identify future research's likely directions.

Theoretical Review

This form aims to examine the corpus of theory accumulated regarding an issue, concept, theory, and phenomenon. The theoretical literature review helps to establish what theories exist, the relationships between them, the degree the existing approaches have been investigated, and to develop new hypotheses to be tested.

Scoping Review

The Scoping Review is often used at the beginning of an article, dissertation, or research proposal. It is conducted before the research to highlight gaps in the existing body of knowledge and explains why the project should be greenlit.

State-of-the-Art Review

The State-of-the-Art review is conducted periodically, focusing on the most recent research. It describes what is currently known, understood, or agreed upon regarding the research topic and highlights where there are still disagreements.

Can you use the first person in a literature review?

When writing literature reviews, you should avoid the usage of first-person pronouns. It means that instead of "I argue that" or "we argue that," the appropriate expression would be "this research paper argues that."

Do you need an abstract for a literature review?

Ideally, yes. It is always good to have a condensed summary that is self-contained and independent of the rest of your review. As for how to draft one, you can follow the same fundamental idea when preparing an abstract for a literature review. It should also include:

  • The research topic and your motivation behind selecting it
  • A one-sentence thesis statement
  • An explanation of the kinds of literature featured in the review
  • Summary of what you've learned
  • Conclusions you drew from the literature you reviewed
  • Potential implications and future scope for research

Here's an example of the abstract of a literature review

Abstract-of-a-literature-review

Is a literature review written in the past tense?

Yes, the literature review should ideally be written in the past tense. You should not use the present or future tense when writing one. The exceptions are when you have statements describing events that happened earlier than the literature you are reviewing or events that are currently occurring; then, you can use the past perfect or present perfect tenses.

How many sources for a literature review?

There are multiple approaches to deciding how many sources to include in a literature review section. The first approach would be to look level you are at as a researcher. For instance, a doctoral thesis might need 60+ sources. In contrast, you might only need to refer to 5-15 sources at the undergraduate level.

The second approach is based on the kind of literature review you are doing — whether it is merely a chapter of your paper or if it is a self-contained paper in itself. When it is just a chapter, sources should equal the total number of pages in your article's body. In the second scenario, you need at least three times as many sources as there are pages in your work.

Quick tips on how to write a literature review

To know how to write a literature review, you must clearly understand its impact and role in establishing your work as substantive research material.

You need to follow the below-mentioned steps, to write a literature review:

  • Outline the purpose behind the literature review
  • Search relevant literature
  • Examine and assess the relevant resources
  • Discover connections by drawing deep insights from the resources
  • Structure planning to write a good literature review

1. Outline and identify the purpose of  a literature review

As a first step on how to write a literature review, you must know what the research question or topic is and what shape you want your literature review to take. Ensure you understand the research topic inside out, or else seek clarifications. You must be able to the answer below questions before you start:

  • How many sources do I need to include?
  • What kind of sources should I analyze?
  • How much should I critically evaluate each source?
  • Should I summarize, synthesize or offer a critique of the sources?
  • Do I need to include any background information or definitions?

Additionally, you should know that the narrower your research topic is, the swifter it will be for you to restrict the number of sources to be analyzed.

2. Search relevant literature

Dig deeper into search engines to discover what has already been published around your chosen topic. Make sure you thoroughly go through appropriate reference sources like books, reports, journal articles, government docs, and web-based resources.

You must prepare a list of keywords and their different variations. You can start your search from any library’s catalog, provided you are an active member of that institution. The exact keywords can be extended to widen your research over other databases and academic search engines like:

  • Google Scholar
  • Microsoft Academic
  • Science.gov

Besides, it is not advisable to go through every resource word by word. Alternatively, what you can do is you can start by reading the abstract and then decide whether that source is relevant to your research or not.

Additionally, you must spend surplus time assessing the quality and relevance of resources. It would help if you tried preparing a list of citations to ensure that there lies no repetition of authors, publications, or articles in the literature review.

3. Examine and assess the sources

It is nearly impossible for you to go through every detail in the research article. So rather than trying to fetch every detail, you have to analyze and decide which research sources resemble closest and appear relevant to your chosen domain.

While analyzing the sources, you should look to find out answers to questions like:

  • What question or problem has the author been describing and debating?
  • What is the definition of critical aspects?
  • How well the theories, approach, and methodology have been explained?
  • Whether the research theory used some conventional or new innovative approach?
  • How relevant are the key findings of the work?
  • In what ways does it relate to other sources on the same topic?
  • What challenges does this research paper pose to the existing theory
  • What are the possible contributions or benefits it adds to the subject domain?

Be always mindful that you refer only to credible and authentic resources. It would be best if you always take references from different publications to validate your theory.

Always keep track of important information or data you can present in your literature review right from the beginning. It will help steer your path from any threats of plagiarism and also make it easier to curate an annotated bibliography or reference section.

4. Discover connections

At this stage, you must start deciding on the argument and structure of your literature review. To accomplish this, you must discover and identify the relations and connections between various resources while drafting your abstract.

A few aspects that you should be aware of while writing a literature review include:

  • Rise to prominence: Theories and methods that have gained reputation and supporters over time.
  • Constant scrutiny: Concepts or theories that repeatedly went under examination.
  • Contradictions and conflicts: Theories, both the supporting and the contradictory ones, for the research topic.
  • Knowledge gaps: What exactly does it fail to address, and how to bridge them with further research?
  • Influential resources: Significant research projects available that have been upheld as milestones or perhaps, something that can modify the current trends

Once you join the dots between various past research works, it will be easier for you to draw a conclusion and identify your contribution to the existing knowledge base.

5. Structure planning to write a good literature review

There exist different ways towards planning and executing the structure of a literature review. The format of a literature review varies and depends upon the length of the research.

Like any other research paper, the literature review format must contain three sections: introduction, body, and conclusion. The goals and objectives of the research question determine what goes inside these three sections.

Nevertheless, a good literature review can be structured according to the chronological, thematic, methodological, or theoretical framework approach.

Literature review samples

1. Standalone

Standalone-Literature-Review

2. As a section of a research paper

Literature-review-as-a-section-of-a-research-paper

How SciSpace Discover makes literature review a breeze?

SciSpace Discover is a one-stop solution to do an effective literature search and get barrier-free access to scientific knowledge. It is an excellent repository where you can find millions of only peer-reviewed articles and full-text PDF files. Here’s more on how you can use it:

Find the right information

Find-the-right-information-using-SciSpace

Find what you want quickly and easily with comprehensive search filters that let you narrow down papers according to PDF availability, year of publishing, document type, and affiliated institution. Moreover, you can sort the results based on the publishing date, citation count, and relevance.

Assess credibility of papers quickly

Assess-credibility-of-papers-quickly-using-SciSpace

When doing the literature review, it is critical to establish the quality of your sources. They form the foundation of your research. SciSpace Discover helps you assess the quality of a source by providing an overview of its references, citations, and performance metrics.

Get the complete picture in no time

SciSpace's-personalized-informtion-engine

SciSpace Discover’s personalized suggestion engine helps you stay on course and get the complete picture of the topic from one place. Every time you visit an article page, it provides you links to related papers. Besides that, it helps you understand what’s trending, who are the top authors, and who are the leading publishers on a topic.

Make referring sources super easy

Make-referring-pages-super-easy-with-SciSpace

To ensure you don't lose track of your sources, you must start noting down your references when doing the literature review. SciSpace Discover makes this step effortless. Click the 'cite' button on an article page, and you will receive preloaded citation text in multiple styles — all you've to do is copy-paste it into your manuscript.

Final tips on how to write a literature review

A massive chunk of time and effort is required to write a good literature review. But, if you go about it systematically, you'll be able to save a ton of time and build a solid foundation for your research.

We hope this guide has helped you answer several key questions you have about writing literature reviews.

Would you like to explore SciSpace Discover and kick off your literature search right away? You can get started here .

Frequently Asked Questions (FAQs)

1. how to start a literature review.

• What questions do you want to answer?

• What sources do you need to answer these questions?

• What information do these sources contain?

• How can you use this information to answer your questions?

2. What to include in a literature review?

• A brief background of the problem or issue

• What has previously been done to address the problem or issue

• A description of what you will do in your project

• How this study will contribute to research on the subject

3. Why literature review is important?

The literature review is an important part of any research project because it allows the writer to look at previous studies on a topic and determine existing gaps in the literature, as well as what has already been done. It will also help them to choose the most appropriate method for their own study.

4. How to cite a literature review in APA format?

To cite a literature review in APA style, you need to provide the author's name, the title of the article, and the year of publication. For example: Patel, A. B., & Stokes, G. S. (2012). The relationship between personality and intelligence: A meta-analysis of longitudinal research. Personality and Individual Differences, 53(1), 16-21

5. What are the components of a literature review?

• A brief introduction to the topic, including its background and context. The introduction should also include a rationale for why the study is being conducted and what it will accomplish.

• A description of the methodologies used in the study. This can include information about data collection methods, sample size, and statistical analyses.

• A presentation of the findings in an organized format that helps readers follow along with the author's conclusions.

6. What are common errors in writing literature review?

• Not spending enough time to critically evaluate the relevance of resources, observations and conclusions.

• Totally relying on secondary data while ignoring primary data.

• Letting your personal bias seep into your interpretation of existing literature.

• No detailed explanation of the procedure to discover and identify an appropriate literature review.

7. What are the 5 C's of writing literature review?

• Cite - the sources you utilized and referenced in your research.

• Compare - existing arguments, hypotheses, methodologies, and conclusions found in the knowledge base.

• Contrast - the arguments, topics, methodologies, approaches, and disputes that may be found in the literature.

• Critique - the literature and describe the ideas and opinions you find more convincing and why.

• Connect - the various studies you reviewed in your research.

8. How many sources should a literature review have?

When it is just a chapter, sources should equal the total number of pages in your article's body. if it is a self-contained paper in itself, you need at least three times as many sources as there are pages in your work.

9. Can literature review have diagrams?

• To represent an abstract idea or concept

• To explain the steps of a process or procedure

• To help readers understand the relationships between different concepts

10. How old should sources be in a literature review?

Sources for a literature review should be as current as possible or not older than ten years. The only exception to this rule is if you are reviewing a historical topic and need to use older sources.

11. What are the types of literature review?

• Argumentative review

• Integrative review

• Methodological review

• Systematic review

• Meta-analysis review

• Historical review

• Theoretical review

• Scoping review

• State-of-the-Art review

12. Is a literature review mandatory?

Yes. Literature review is a mandatory part of any research project. It is a critical step in the process that allows you to establish the scope of your research, and provide a background for the rest of your work.

But before you go,

  • Six Online Tools for Easy Literature Review
  • Evaluating literature review: systematic vs. scoping reviews
  • Systematic Approaches to a Successful Literature Review
  • Writing Integrative Literature Reviews: Guidelines and Examples

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The Literature Review

The Literature Review A Step-by-Step Guide for Students

  • Diana Ridley - Sheffield University, UK
  • Description

New to this edition are:

  • Examples drawn from a wide range of disciplines
  • A new chapter on conducting systematic reviews
  • Increased guidance on evaluating the quality of online sources and online literature
  • Enhanced guidance in dealing with copyright and permissions issues.

This book also comes with a companion website containing a wide range of examples of successful literature reviews from various academic disciplines. SAGE Study Skills are essential study guides for students of all levels. From how to write great essays and succeeding at university, to writing your undergraduate dissertation and doing postgraduate research, SAGE Study Skills help you get the best from your time at university. Visit the SAGE Study Skills hub  for tips, quizzes and videos on study success!

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Visit the SAGE Study Skills hub  for tips, resources and videos on study success!

'The Literature Review is a clearly written and easily accessible self-guided introduction packed with detailed examples. It's especially useful for budding researchers unfamiliar with crafting literature reviews that support strong theory development and empirical testing. I recommend it to every first-year doctoral student' - Michael R. Hyman Distinguished Achievement Professor, New Mexico State University

Excellent book, providing very good guidance on how to conduct a literature review.

Provides specific guidance on doing a literature review which is relevant to UG and PG students.

This text will support our trainees with their M-level study. A very useful text.

My students have found this book so helpful. The step-by-step approach offers clarity and helps build students' confidence in conducting a literature review.

Thank you very much for this insepction copy. This book is current and comprehensive. It includes useful consideration of referencing software. It has a particulalry easy to follow format with lots of text boxes and excercises. It is particularly useful for those new to literature searching.

This is an excellent book, clearly written and suitable for undergraduate students.

It outlines the purpose of literature review and gives good information about note taking and how be critical.

This book should help my students with the part of the research process to often struggle with.

Excellent guide. A must read for postgraduate learners.

This book provides detailed insights into carrying out the reserach for a literature review. Also it provides excellent step-by-step guidance in the writing process.

Helpful for students at all levels. The framework is useful for students trying to grasp a complicated procedure. The systematic literature review chapter is a nice addition. A great resource for students.

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  • Determine inclusion and exclusion criteria
  • Choose databases and search
  • Review Results
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What is a Literature Review?

A literature or narrative review is a comprehensive review and analysis of the published literature on a specific topic or research question. The literature that is reviewed contains: books, articles, academic articles, conference proceedings, association papers, and dissertations. It contains the most pertinent studies and points to important past and current research and practices. It provides background and context, and shows how your research will contribute to the field. 

A literature review should: 

  • Provide a comprehensive and updated review of the literature;
  • Explain why this review has taken place;
  • Articulate a position or hypothesis;
  • Acknowledge and account for conflicting and corroborating points of view

From  S age Research Methods

Purpose of a Literature Review

A literature review can be written as an introduction to a study to:

  • Demonstrate how a study fills a gap in research
  • Compare a study with other research that's been done

Or it can be a separate work (a research article on its own) which:

  • Organizes or describes a topic
  • Describes variables within a particular issue/problem

Limitations of a Literature Review

Some of the limitations of a literature review are:

  • It's a snapshot in time. Unlike other reviews, this one has beginning, a middle and an end. There may be future developments that could make your work less relevant.
  • It may be too focused. Some niche studies may miss the bigger picture.
  • It can be difficult to be comprehensive. There is no way to make sure all the literature on a topic was considered.
  • It is easy to be biased if you stick to top tier journals. There may be other places where people are publishing exemplary research. Look to open access publications and conferences to reflect a more inclusive collection. Also, make sure to include opposing views (and not just supporting evidence).

Source: Grant, Maria J., and Andrew Booth. “A Typology of Reviews: An Analysis of 14 Review Types and Associated Methodologies.” Health Information & Libraries Journal, vol. 26, no. 2, June 2009, pp. 91–108. Wiley Online Library, doi:10.1111/j.1471-1842.2009.00848.x.

Meryl Brodsky : Communication and Information Studies

Hannah Chapman Tripp : Biology, Neuroscience

Carolyn Cunningham : Human Development & Family Sciences, Psychology, Sociology

Larayne Dallas : Engineering

Janelle Hedstrom : Special Education, Curriculum & Instruction, Ed Leadership & Policy ​

Susan Macicak : Linguistics

Imelda Vetter : Dell Medical School

For help in other subject areas, please see the guide to library specialists by subject .

Periodically, UT Libraries runs a workshop covering the basics and library support for literature reviews. While we try to offer these once per academic year, we find providing the recording to be helpful to community members who have missed the session. Following is the most recent recording of the workshop, Conducting a Literature Review. To view the recording, a UT login is required.

  • October 26, 2022 recording
  • Last Updated: Oct 26, 2022 2:49 PM
  • URL: https://guides.lib.utexas.edu/literaturereviews

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  • UConn Library
  • Literature Review: The What, Why and How-to Guide
  • Introduction

Literature Review: The What, Why and How-to Guide — Introduction

  • Getting Started
  • How to Pick a Topic
  • Strategies to Find Sources
  • Evaluating Sources & Lit. Reviews
  • Tips for Writing Literature Reviews
  • Writing Literature Review: Useful Sites
  • Citation Resources
  • Other Academic Writings

What are Literature Reviews?

So, what is a literature review? "A literature review is an account of what has been published on a topic by accredited scholars and researchers. In writing the literature review, your purpose is to convey to your reader what knowledge and ideas have been established on a topic, and what their strengths and weaknesses are. As a piece of writing, the literature review must be defined by a guiding concept (e.g., your research objective, the problem or issue you are discussing, or your argumentative thesis). It is not just a descriptive list of the material available, or a set of summaries." Taylor, D.  The literature review: A few tips on conducting it . University of Toronto Health Sciences Writing Centre.

Goals of Literature Reviews

What are the goals of creating a Literature Review?  A literature could be written to accomplish different aims:

  • To develop a theory or evaluate an existing theory
  • To summarize the historical or existing state of a research topic
  • Identify a problem in a field of research 

Baumeister, R. F., & Leary, M. R. (1997). Writing narrative literature reviews .  Review of General Psychology , 1 (3), 311-320.

What kinds of sources require a Literature Review?

  • A research paper assigned in a course
  • A thesis or dissertation
  • A grant proposal
  • An article intended for publication in a journal

All these instances require you to collect what has been written about your research topic so that you can demonstrate how your own research sheds new light on the topic.

Types of Literature Reviews

What kinds of literature reviews are written?

Narrative review: The purpose of this type of review is to describe the current state of the research on a specific topic/research and to offer a critical analysis of the literature reviewed. Studies are grouped by research/theoretical categories, and themes and trends, strengths and weakness, and gaps are identified. The review ends with a conclusion section which summarizes the findings regarding the state of the research of the specific study, the gaps identify and if applicable, explains how the author's research will address gaps identify in the review and expand the knowledge on the topic reviewed.

  • Example : Predictors and Outcomes of U.S. Quality Maternity Leave: A Review and Conceptual Framework:  10.1177/08948453211037398  

Systematic review : "The authors of a systematic review use a specific procedure to search the research literature, select the studies to include in their review, and critically evaluate the studies they find." (p. 139). Nelson, L. K. (2013). Research in Communication Sciences and Disorders . Plural Publishing.

  • Example : The effect of leave policies on increasing fertility: a systematic review:  10.1057/s41599-022-01270-w

Meta-analysis : "Meta-analysis is a method of reviewing research findings in a quantitative fashion by transforming the data from individual studies into what is called an effect size and then pooling and analyzing this information. The basic goal in meta-analysis is to explain why different outcomes have occurred in different studies." (p. 197). Roberts, M. C., & Ilardi, S. S. (2003). Handbook of Research Methods in Clinical Psychology . Blackwell Publishing.

  • Example : Employment Instability and Fertility in Europe: A Meta-Analysis:  10.1215/00703370-9164737

Meta-synthesis : "Qualitative meta-synthesis is a type of qualitative study that uses as data the findings from other qualitative studies linked by the same or related topic." (p.312). Zimmer, L. (2006). Qualitative meta-synthesis: A question of dialoguing with texts .  Journal of Advanced Nursing , 53 (3), 311-318.

  • Example : Women’s perspectives on career successes and barriers: A qualitative meta-synthesis:  10.1177/05390184221113735

Literature Reviews in the Health Sciences

  • UConn Health subject guide on systematic reviews Explanation of the different review types used in health sciences literature as well as tools to help you find the right review type
  • << Previous: Getting Started
  • Next: How to Pick a Topic >>
  • Last Updated: Sep 21, 2022 2:16 PM
  • URL: https://guides.lib.uconn.edu/literaturereview

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  • 04 December 2020
  • Correction 09 December 2020

How to write a superb literature review

Andy Tay is a freelance writer based in Singapore.

You can also search for this author in PubMed   Google Scholar

Literature reviews are important resources for scientists. They provide historical context for a field while offering opinions on its future trajectory. Creating them can provide inspiration for one’s own research, as well as some practice in writing. But few scientists are trained in how to write a review — or in what constitutes an excellent one. Even picking the appropriate software to use can be an involved decision (see ‘Tools and techniques’). So Nature asked editors and working scientists with well-cited reviews for their tips.

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doi: https://doi.org/10.1038/d41586-020-03422-x

Interviews have been edited for length and clarity.

Updates & Corrections

Correction 09 December 2020 : An earlier version of the tables in this article included some incorrect details about the programs Zotero, Endnote and Manubot. These have now been corrected.

Hsing, I.-M., Xu, Y. & Zhao, W. Electroanalysis 19 , 755–768 (2007).

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Ledesma, H. A. et al. Nature Nanotechnol. 14 , 645–657 (2019).

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Choi, Y. & Lee, S. Y. Nature Rev. Chem . https://doi.org/10.1038/s41570-020-00221-w (2020).

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What is a literature review?

A literature review is an integrated analysis -- not just a summary-- of scholarly writings and other relevant evidence related directly to your research question.  That is, it represents a synthesis of the evidence that provides background information on your topic and shows a association between the evidence and your research question.

A literature review may be a stand alone work or the introduction to a larger research paper, depending on the assignment.  Rely heavily on the guidelines your instructor has given you.

Why is it important?

A literature review is important because it:

  • Explains the background of research on a topic.
  • Demonstrates why a topic is significant to a subject area.
  • Discovers relationships between research studies/ideas.
  • Identifies major themes, concepts, and researchers on a topic.
  • Identifies critical gaps and points of disagreement.
  • Discusses further research questions that logically come out of the previous studies.

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1. Choose a topic. Define your research question.

Your literature review should be guided by your central research question.  The literature represents background and research developments related to a specific research question, interpreted and analyzed by you in a synthesized way.

  • Make sure your research question is not too broad or too narrow.  Is it manageable?
  • Begin writing down terms that are related to your question. These will be useful for searches later.
  • If you have the opportunity, discuss your topic with your professor and your class mates.

2. Decide on the scope of your review

How many studies do you need to look at? How comprehensive should it be? How many years should it cover? 

  • This may depend on your assignment.  How many sources does the assignment require?

3. Select the databases you will use to conduct your searches.

Make a list of the databases you will search. 

Where to find databases:

  • use the tabs on this guide
  • Find other databases in the Nursing Information Resources web page
  • More on the Medical Library web page
  • ... and more on the Yale University Library web page

4. Conduct your searches to find the evidence. Keep track of your searches.

  • Use the key words in your question, as well as synonyms for those words, as terms in your search. Use the database tutorials for help.
  • Save the searches in the databases. This saves time when you want to redo, or modify, the searches. It is also helpful to use as a guide is the searches are not finding any useful results.
  • Review the abstracts of research studies carefully. This will save you time.
  • Use the bibliographies and references of research studies you find to locate others.
  • Check with your professor, or a subject expert in the field, if you are missing any key works in the field.
  • Ask your librarian for help at any time.
  • Use a citation manager, such as EndNote as the repository for your citations. See the EndNote tutorials for help.

Review the literature

Some questions to help you analyze the research:

  • What was the research question of the study you are reviewing? What were the authors trying to discover?
  • Was the research funded by a source that could influence the findings?
  • What were the research methodologies? Analyze its literature review, the samples and variables used, the results, and the conclusions.
  • Does the research seem to be complete? Could it have been conducted more soundly? What further questions does it raise?
  • If there are conflicting studies, why do you think that is?
  • How are the authors viewed in the field? Has this study been cited? If so, how has it been analyzed?

Tips: 

  • Review the abstracts carefully.  
  • Keep careful notes so that you may track your thought processes during the research process.
  • Create a matrix of the studies for easy analysis, and synthesis, across all of the studies.
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  • What is a Literature Review? | Guide, Template, & Examples

What is a Literature Review? | Guide, Template, & Examples

Published on 22 February 2022 by Shona McCombes . Revised on 7 June 2022.

What is a literature review? A literature review is a survey of scholarly sources on a specific topic. It provides an overview of current knowledge, allowing you to identify relevant theories, methods, and gaps in the existing research.

There are five key steps to writing a literature review:

  • Search for relevant literature
  • Evaluate sources
  • Identify themes, debates and gaps
  • Outline the structure
  • Write your literature review

A good literature review doesn’t just summarise sources – it analyses, synthesises, and critically evaluates to give a clear picture of the state of knowledge on the subject.

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Table of contents

Why write a literature review, examples of literature reviews, step 1: search for relevant literature, step 2: evaluate and select sources, step 3: identify themes, debates and gaps, step 4: outline your literature review’s structure, step 5: write your literature review, frequently asked questions about literature reviews, introduction.

  • Quick Run-through
  • Step 1 & 2

When you write a dissertation or thesis, you will have to conduct a literature review to situate your research within existing knowledge. The literature review gives you a chance to:

  • Demonstrate your familiarity with the topic and scholarly context
  • Develop a theoretical framework and methodology for your research
  • Position yourself in relation to other researchers and theorists
  • Show how your dissertation addresses a gap or contributes to a debate

You might also have to write a literature review as a stand-alone assignment. In this case, the purpose is to evaluate the current state of research and demonstrate your knowledge of scholarly debates around a topic.

The content will look slightly different in each case, but the process of conducting a literature review follows the same steps. We’ve written a step-by-step guide that you can follow below.

Literature review guide

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Writing literature reviews can be quite challenging! A good starting point could be to look at some examples, depending on what kind of literature review you’d like to write.

  • Example literature review #1: “Why Do People Migrate? A Review of the Theoretical Literature” ( Theoretical literature review about the development of economic migration theory from the 1950s to today.)
  • Example literature review #2: “Literature review as a research methodology: An overview and guidelines” ( Methodological literature review about interdisciplinary knowledge acquisition and production.)
  • Example literature review #3: “The Use of Technology in English Language Learning: A Literature Review” ( Thematic literature review about the effects of technology on language acquisition.)
  • Example literature review #4: “Learners’ Listening Comprehension Difficulties in English Language Learning: A Literature Review” ( Chronological literature review about how the concept of listening skills has changed over time.)

You can also check out our templates with literature review examples and sample outlines at the links below.

Download Word doc Download Google doc

Before you begin searching for literature, you need a clearly defined topic .

If you are writing the literature review section of a dissertation or research paper, you will search for literature related to your research objectives and questions .

If you are writing a literature review as a stand-alone assignment, you will have to choose a focus and develop a central question to direct your search. Unlike a dissertation research question, this question has to be answerable without collecting original data. You should be able to answer it based only on a review of existing publications.

Make a list of keywords

Start by creating a list of keywords related to your research topic. Include each of the key concepts or variables you’re interested in, and list any synonyms and related terms. You can add to this list if you discover new keywords in the process of your literature search.

  • Social media, Facebook, Instagram, Twitter, Snapchat, TikTok
  • Body image, self-perception, self-esteem, mental health
  • Generation Z, teenagers, adolescents, youth

Search for relevant sources

Use your keywords to begin searching for sources. Some databases to search for journals and articles include:

  • Your university’s library catalogue
  • Google Scholar
  • Project Muse (humanities and social sciences)
  • Medline (life sciences and biomedicine)
  • EconLit (economics)
  • Inspec (physics, engineering and computer science)

You can use boolean operators to help narrow down your search:

Read the abstract to find out whether an article is relevant to your question. When you find a useful book or article, you can check the bibliography to find other relevant sources.

To identify the most important publications on your topic, take note of recurring citations. If the same authors, books or articles keep appearing in your reading, make sure to seek them out.

You probably won’t be able to read absolutely everything that has been written on the topic – you’ll have to evaluate which sources are most relevant to your questions.

For each publication, ask yourself:

  • What question or problem is the author addressing?
  • What are the key concepts and how are they defined?
  • What are the key theories, models and methods? Does the research use established frameworks or take an innovative approach?
  • What are the results and conclusions of the study?
  • How does the publication relate to other literature in the field? Does it confirm, add to, or challenge established knowledge?
  • How does the publication contribute to your understanding of the topic? What are its key insights and arguments?
  • What are the strengths and weaknesses of the research?

Make sure the sources you use are credible, and make sure you read any landmark studies and major theories in your field of research.

You can find out how many times an article has been cited on Google Scholar – a high citation count means the article has been influential in the field, and should certainly be included in your literature review.

The scope of your review will depend on your topic and discipline: in the sciences you usually only review recent literature, but in the humanities you might take a long historical perspective (for example, to trace how a concept has changed in meaning over time).

Remember that you can use our template to summarise and evaluate sources you’re thinking about using!

Take notes and cite your sources

As you read, you should also begin the writing process. Take notes that you can later incorporate into the text of your literature review.

It’s important to keep track of your sources with references to avoid plagiarism . It can be helpful to make an annotated bibliography, where you compile full reference information and write a paragraph of summary and analysis for each source. This helps you remember what you read and saves time later in the process.

You can use our free APA Reference Generator for quick, correct, consistent citations.

To begin organising your literature review’s argument and structure, you need to understand the connections and relationships between the sources you’ve read. Based on your reading and notes, you can look for:

  • Trends and patterns (in theory, method or results): do certain approaches become more or less popular over time?
  • Themes: what questions or concepts recur across the literature?
  • Debates, conflicts and contradictions: where do sources disagree?
  • Pivotal publications: are there any influential theories or studies that changed the direction of the field?
  • Gaps: what is missing from the literature? Are there weaknesses that need to be addressed?

This step will help you work out the structure of your literature review and (if applicable) show how your own research will contribute to existing knowledge.

  • Most research has focused on young women.
  • There is an increasing interest in the visual aspects of social media.
  • But there is still a lack of robust research on highly-visual platforms like Instagram and Snapchat – this is a gap that you could address in your own research.

There are various approaches to organising the body of a literature review. You should have a rough idea of your strategy before you start writing.

Depending on the length of your literature review, you can combine several of these strategies (for example, your overall structure might be thematic, but each theme is discussed chronologically).

Chronological

The simplest approach is to trace the development of the topic over time. However, if you choose this strategy, be careful to avoid simply listing and summarising sources in order.

Try to analyse patterns, turning points and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred.

If you have found some recurring central themes, you can organise your literature review into subsections that address different aspects of the topic.

For example, if you are reviewing literature about inequalities in migrant health outcomes, key themes might include healthcare policy, language barriers, cultural attitudes, legal status, and economic access.

Methodological

If you draw your sources from different disciplines or fields that use a variety of research methods , you might want to compare the results and conclusions that emerge from different approaches. For example:

  • Look at what results have emerged in qualitative versus quantitative research
  • Discuss how the topic has been approached by empirical versus theoretical scholarship
  • Divide the literature into sociological, historical, and cultural sources

Theoretical

A literature review is often the foundation for a theoretical framework . You can use it to discuss various theories, models, and definitions of key concepts.

You might argue for the relevance of a specific theoretical approach, or combine various theoretical concepts to create a framework for your research.

Like any other academic text, your literature review should have an introduction , a main body, and a conclusion . What you include in each depends on the objective of your literature review.

The introduction should clearly establish the focus and purpose of the literature review.

If you are writing the literature review as part of your dissertation or thesis, reiterate your central problem or research question and give a brief summary of the scholarly context. You can emphasise the timeliness of the topic (“many recent studies have focused on the problem of x”) or highlight a gap in the literature (“while there has been much research on x, few researchers have taken y into consideration”).

Depending on the length of your literature review, you might want to divide the body into subsections. You can use a subheading for each theme, time period, or methodological approach.

As you write, make sure to follow these tips:

  • Summarise and synthesise: give an overview of the main points of each source and combine them into a coherent whole.
  • Analyse and interpret: don’t just paraphrase other researchers – add your own interpretations, discussing the significance of findings in relation to the literature as a whole.
  • Critically evaluate: mention the strengths and weaknesses of your sources.
  • Write in well-structured paragraphs: use transitions and topic sentences to draw connections, comparisons and contrasts.

In the conclusion, you should summarise the key findings you have taken from the literature and emphasise their significance.

If the literature review is part of your dissertation or thesis, reiterate how your research addresses gaps and contributes new knowledge, or discuss how you have drawn on existing theories and methods to build a framework for your research. This can lead directly into your methodology section.

A literature review is a survey of scholarly sources (such as books, journal articles, and theses) related to a specific topic or research question .

It is often written as part of a dissertation , thesis, research paper , or proposal .

There are several reasons to conduct a literature review at the beginning of a research project:

  • To familiarise yourself with the current state of knowledge on your topic
  • To ensure that you’re not just repeating what others have already done
  • To identify gaps in knowledge and unresolved problems that your research can address
  • To develop your theoretical framework and methodology
  • To provide an overview of the key findings and debates on the topic

Writing the literature review shows your reader how your work relates to existing research and what new insights it will contribute.

The literature review usually comes near the beginning of your  dissertation . After the introduction , it grounds your research in a scholarly field and leads directly to your theoretical framework or methodology .

Cite this Scribbr article

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Literature Reviews

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The Library's Subject Specialists are happy to help with your literature reviews!  Find your Subject Specialist here . 

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Conducting Your Literature Review: Concise Guides to Conducting Behavioral, Health, and Social Science Research by Susanne Hempel (2020) 

Conducting Research Literature Reviews: From the Internet to Paper by Arlene Fink (2020)

Johns Hopkins University Library guide on Write a Literature Review

Some content was modified from an original Literature Reviews for Dissertations guide authored by Lori Tschirhart. 

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  • Conducting Your Literature Review (2019) by Susanne Hempel

Video Recording

Whether you’re working on a chapter for your dissertation or a section of a scholarly article, writing literature reviews is tough. But there are some tips that can help you to conduct effective and efficient literature reviews.

In this workshop, you’ll learn how to:

  • Determine which type of literature review you need to do (scoping review, systematic review, meta-analysis, etc.)
  • Search scholarly databases effectively for literature, including saving searches and setting up alerts
  • Utilize citation management software (Mendeley, EndNote, or Zotero) to keep your literature organized
  • Get personalized assistance from a librarian

Presenter: Joanna Thielen, Engineering Librarian

Follow along with the GoogleSlide deck

Resources on searching the literature.

  • Literature Search Best Practices guide  - provides in depth and step-by-step guidance on how conduct an effective literature search. 

RESOURCES ON SCOPING AND SYSTEMATIC REVIEWS

  • Knowledge syntheses: Systematic & Scoping Reviews, and other review types  — provides information and resources to learn about the different types of knowledge syntheses (method-driven reviews), such as systematic reviews, scoping reviews, rapid reviews, among others, and the process of conducting them. 
  • Challenges & Solutions in Scoping Reviews video  — his recorded webinar discusses challenges of conducting a scoping review (from developing the a priori protocol to finalizing the review report for publication and developing implications or recommendations for research, policy, and practice from the results of the review) and provides solutions that can be implemented by research teams.
  • Joanna Briggs Institute (JBI) Manual for Evidence Synthesis  — comprehensive and free online guide that has separate chapters devoted to the synthesis of different types of evidence and to address different types of review questions.
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A literature review is a review and synthesis of existing research on a topic or research question. A literature review is meant to analyze the scholarly literature, make connections across writings and identify strengths, weaknesses, trends, and missing conversations. A literature review should address different aspects of a topic as it relates to your research question. A literature review goes beyond a description or summary of the literature you have read. 

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A literature review is a document or section of a document that collects key sources on a topic and discusses those sources in conversation with each other (also called synthesis ). The lit review is an important genre in many disciplines, not just literature (i.e., the study of works of literature such as novels and plays). When we say “literature review” or refer to “the literature,” we are talking about the research ( scholarship ) in a given field. You will often see the terms “the research,” “the scholarship,” and “the literature” used mostly interchangeably.

Where, when, and why would I write a lit review?

There are a number of different situations where you might write a literature review, each with slightly different expectations; different disciplines, too, have field-specific expectations for what a literature review is and does. For instance, in the humanities, authors might include more overt argumentation and interpretation of source material in their literature reviews, whereas in the sciences, authors are more likely to report study designs and results in their literature reviews; these differences reflect these disciplines’ purposes and conventions in scholarship. You should always look at examples from your own discipline and talk to professors or mentors in your field to be sure you understand your discipline’s conventions, for literature reviews as well as for any other genre.

A literature review can be a part of a research paper or scholarly article, usually falling after the introduction and before the research methods sections. In these cases, the lit review just needs to cover scholarship that is important to the issue you are writing about; sometimes it will also cover key sources that informed your research methodology.

Lit reviews can also be standalone pieces, either as assignments in a class or as publications. In a class, a lit review may be assigned to help students familiarize themselves with a topic and with scholarship in their field, get an idea of the other researchers working on the topic they’re interested in, find gaps in existing research in order to propose new projects, and/or develop a theoretical framework and methodology for later research. As a publication, a lit review usually is meant to help make other scholars’ lives easier by collecting and summarizing, synthesizing, and analyzing existing research on a topic. This can be especially helpful for students or scholars getting into a new research area, or for directing an entire community of scholars toward questions that have not yet been answered.

What are the parts of a lit review?

Most lit reviews use a basic introduction-body-conclusion structure; if your lit review is part of a larger paper, the introduction and conclusion pieces may be just a few sentences while you focus most of your attention on the body. If your lit review is a standalone piece, the introduction and conclusion take up more space and give you a place to discuss your goals, research methods, and conclusions separately from where you discuss the literature itself.

Introduction:

  • An introductory paragraph that explains what your working topic and thesis is
  • A forecast of key topics or texts that will appear in the review
  • Potentially, a description of how you found sources and how you analyzed them for inclusion and discussion in the review (more often found in published, standalone literature reviews than in lit review sections in an article or research paper)
  • Summarize and synthesize: Give an overview of the main points of each source and combine them into a coherent whole
  • Analyze and interpret: Don’t just paraphrase other researchers – add your own interpretations where possible, discussing the significance of findings in relation to the literature as a whole
  • Critically Evaluate: Mention the strengths and weaknesses of your sources
  • Write in well-structured paragraphs: Use transition words and topic sentence to draw connections, comparisons, and contrasts.

Conclusion:

  • Summarize the key findings you have taken from the literature and emphasize their significance
  • Connect it back to your primary research question

How should I organize my lit review?

Lit reviews can take many different organizational patterns depending on what you are trying to accomplish with the review. Here are some examples:

  • Chronological : The simplest approach is to trace the development of the topic over time, which helps familiarize the audience with the topic (for instance if you are introducing something that is not commonly known in your field). If you choose this strategy, be careful to avoid simply listing and summarizing sources in order. Try to analyze the patterns, turning points, and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred (as mentioned previously, this may not be appropriate in your discipline — check with a teacher or mentor if you’re unsure).
  • Thematic : If you have found some recurring central themes that you will continue working with throughout your piece, you can organize your literature review into subsections that address different aspects of the topic. For example, if you are reviewing literature about women and religion, key themes can include the role of women in churches and the religious attitude towards women.
  • Qualitative versus quantitative research
  • Empirical versus theoretical scholarship
  • Divide the research by sociological, historical, or cultural sources
  • Theoretical : In many humanities articles, the literature review is the foundation for the theoretical framework. You can use it to discuss various theories, models, and definitions of key concepts. You can argue for the relevance of a specific theoretical approach or combine various theorical concepts to create a framework for your research.

What are some strategies or tips I can use while writing my lit review?

Any lit review is only as good as the research it discusses; make sure your sources are well-chosen and your research is thorough. Don’t be afraid to do more research if you discover a new thread as you’re writing. More info on the research process is available in our "Conducting Research" resources .

As you’re doing your research, create an annotated bibliography ( see our page on the this type of document ). Much of the information used in an annotated bibliography can be used also in a literature review, so you’ll be not only partially drafting your lit review as you research, but also developing your sense of the larger conversation going on among scholars, professionals, and any other stakeholders in your topic.

Usually you will need to synthesize research rather than just summarizing it. This means drawing connections between sources to create a picture of the scholarly conversation on a topic over time. Many student writers struggle to synthesize because they feel they don’t have anything to add to the scholars they are citing; here are some strategies to help you:

  • It often helps to remember that the point of these kinds of syntheses is to show your readers how you understand your research, to help them read the rest of your paper.
  • Writing teachers often say synthesis is like hosting a dinner party: imagine all your sources are together in a room, discussing your topic. What are they saying to each other?
  • Look at the in-text citations in each paragraph. Are you citing just one source for each paragraph? This usually indicates summary only. When you have multiple sources cited in a paragraph, you are more likely to be synthesizing them (not always, but often
  • Read more about synthesis here.

The most interesting literature reviews are often written as arguments (again, as mentioned at the beginning of the page, this is discipline-specific and doesn’t work for all situations). Often, the literature review is where you can establish your research as filling a particular gap or as relevant in a particular way. You have some chance to do this in your introduction in an article, but the literature review section gives a more extended opportunity to establish the conversation in the way you would like your readers to see it. You can choose the intellectual lineage you would like to be part of and whose definitions matter most to your thinking (mostly humanities-specific, but this goes for sciences as well). In addressing these points, you argue for your place in the conversation, which tends to make the lit review more compelling than a simple reporting of other sources.

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Ten Simple Rules for Writing a Literature Review

Marco pautasso.

1 Centre for Functional and Evolutionary Ecology (CEFE), CNRS, Montpellier, France

2 Centre for Biodiversity Synthesis and Analysis (CESAB), FRB, Aix-en-Provence, France

Literature reviews are in great demand in most scientific fields. Their need stems from the ever-increasing output of scientific publications [1] . For example, compared to 1991, in 2008 three, eight, and forty times more papers were indexed in Web of Science on malaria, obesity, and biodiversity, respectively [2] . Given such mountains of papers, scientists cannot be expected to examine in detail every single new paper relevant to their interests [3] . Thus, it is both advantageous and necessary to rely on regular summaries of the recent literature. Although recognition for scientists mainly comes from primary research, timely literature reviews can lead to new synthetic insights and are often widely read [4] . For such summaries to be useful, however, they need to be compiled in a professional way [5] .

When starting from scratch, reviewing the literature can require a titanic amount of work. That is why researchers who have spent their career working on a certain research issue are in a perfect position to review that literature. Some graduate schools are now offering courses in reviewing the literature, given that most research students start their project by producing an overview of what has already been done on their research issue [6] . However, it is likely that most scientists have not thought in detail about how to approach and carry out a literature review.

Reviewing the literature requires the ability to juggle multiple tasks, from finding and evaluating relevant material to synthesising information from various sources, from critical thinking to paraphrasing, evaluating, and citation skills [7] . In this contribution, I share ten simple rules I learned working on about 25 literature reviews as a PhD and postdoctoral student. Ideas and insights also come from discussions with coauthors and colleagues, as well as feedback from reviewers and editors.

Rule 1: Define a Topic and Audience

How to choose which topic to review? There are so many issues in contemporary science that you could spend a lifetime of attending conferences and reading the literature just pondering what to review. On the one hand, if you take several years to choose, several other people may have had the same idea in the meantime. On the other hand, only a well-considered topic is likely to lead to a brilliant literature review [8] . The topic must at least be:

  • interesting to you (ideally, you should have come across a series of recent papers related to your line of work that call for a critical summary),
  • an important aspect of the field (so that many readers will be interested in the review and there will be enough material to write it), and
  • a well-defined issue (otherwise you could potentially include thousands of publications, which would make the review unhelpful).

Ideas for potential reviews may come from papers providing lists of key research questions to be answered [9] , but also from serendipitous moments during desultory reading and discussions. In addition to choosing your topic, you should also select a target audience. In many cases, the topic (e.g., web services in computational biology) will automatically define an audience (e.g., computational biologists), but that same topic may also be of interest to neighbouring fields (e.g., computer science, biology, etc.).

Rule 2: Search and Re-search the Literature

After having chosen your topic and audience, start by checking the literature and downloading relevant papers. Five pieces of advice here:

  • keep track of the search items you use (so that your search can be replicated [10] ),
  • keep a list of papers whose pdfs you cannot access immediately (so as to retrieve them later with alternative strategies),
  • use a paper management system (e.g., Mendeley, Papers, Qiqqa, Sente),
  • define early in the process some criteria for exclusion of irrelevant papers (these criteria can then be described in the review to help define its scope), and
  • do not just look for research papers in the area you wish to review, but also seek previous reviews.

The chances are high that someone will already have published a literature review ( Figure 1 ), if not exactly on the issue you are planning to tackle, at least on a related topic. If there are already a few or several reviews of the literature on your issue, my advice is not to give up, but to carry on with your own literature review,

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The bottom-right situation (many literature reviews but few research papers) is not just a theoretical situation; it applies, for example, to the study of the impacts of climate change on plant diseases, where there appear to be more literature reviews than research studies [33] .

  • discussing in your review the approaches, limitations, and conclusions of past reviews,
  • trying to find a new angle that has not been covered adequately in the previous reviews, and
  • incorporating new material that has inevitably accumulated since their appearance.

When searching the literature for pertinent papers and reviews, the usual rules apply:

  • be thorough,
  • use different keywords and database sources (e.g., DBLP, Google Scholar, ISI Proceedings, JSTOR Search, Medline, Scopus, Web of Science), and
  • look at who has cited past relevant papers and book chapters.

Rule 3: Take Notes While Reading

If you read the papers first, and only afterwards start writing the review, you will need a very good memory to remember who wrote what, and what your impressions and associations were while reading each single paper. My advice is, while reading, to start writing down interesting pieces of information, insights about how to organize the review, and thoughts on what to write. This way, by the time you have read the literature you selected, you will already have a rough draft of the review.

Of course, this draft will still need much rewriting, restructuring, and rethinking to obtain a text with a coherent argument [11] , but you will have avoided the danger posed by staring at a blank document. Be careful when taking notes to use quotation marks if you are provisionally copying verbatim from the literature. It is advisable then to reformulate such quotes with your own words in the final draft. It is important to be careful in noting the references already at this stage, so as to avoid misattributions. Using referencing software from the very beginning of your endeavour will save you time.

Rule 4: Choose the Type of Review You Wish to Write

After having taken notes while reading the literature, you will have a rough idea of the amount of material available for the review. This is probably a good time to decide whether to go for a mini- or a full review. Some journals are now favouring the publication of rather short reviews focusing on the last few years, with a limit on the number of words and citations. A mini-review is not necessarily a minor review: it may well attract more attention from busy readers, although it will inevitably simplify some issues and leave out some relevant material due to space limitations. A full review will have the advantage of more freedom to cover in detail the complexities of a particular scientific development, but may then be left in the pile of the very important papers “to be read” by readers with little time to spare for major monographs.

There is probably a continuum between mini- and full reviews. The same point applies to the dichotomy of descriptive vs. integrative reviews. While descriptive reviews focus on the methodology, findings, and interpretation of each reviewed study, integrative reviews attempt to find common ideas and concepts from the reviewed material [12] . A similar distinction exists between narrative and systematic reviews: while narrative reviews are qualitative, systematic reviews attempt to test a hypothesis based on the published evidence, which is gathered using a predefined protocol to reduce bias [13] , [14] . When systematic reviews analyse quantitative results in a quantitative way, they become meta-analyses. The choice between different review types will have to be made on a case-by-case basis, depending not just on the nature of the material found and the preferences of the target journal(s), but also on the time available to write the review and the number of coauthors [15] .

Rule 5: Keep the Review Focused, but Make It of Broad Interest

Whether your plan is to write a mini- or a full review, it is good advice to keep it focused 16 , 17 . Including material just for the sake of it can easily lead to reviews that are trying to do too many things at once. The need to keep a review focused can be problematic for interdisciplinary reviews, where the aim is to bridge the gap between fields [18] . If you are writing a review on, for example, how epidemiological approaches are used in modelling the spread of ideas, you may be inclined to include material from both parent fields, epidemiology and the study of cultural diffusion. This may be necessary to some extent, but in this case a focused review would only deal in detail with those studies at the interface between epidemiology and the spread of ideas.

While focus is an important feature of a successful review, this requirement has to be balanced with the need to make the review relevant to a broad audience. This square may be circled by discussing the wider implications of the reviewed topic for other disciplines.

Rule 6: Be Critical and Consistent

Reviewing the literature is not stamp collecting. A good review does not just summarize the literature, but discusses it critically, identifies methodological problems, and points out research gaps [19] . After having read a review of the literature, a reader should have a rough idea of:

  • the major achievements in the reviewed field,
  • the main areas of debate, and
  • the outstanding research questions.

It is challenging to achieve a successful review on all these fronts. A solution can be to involve a set of complementary coauthors: some people are excellent at mapping what has been achieved, some others are very good at identifying dark clouds on the horizon, and some have instead a knack at predicting where solutions are going to come from. If your journal club has exactly this sort of team, then you should definitely write a review of the literature! In addition to critical thinking, a literature review needs consistency, for example in the choice of passive vs. active voice and present vs. past tense.

Rule 7: Find a Logical Structure

Like a well-baked cake, a good review has a number of telling features: it is worth the reader's time, timely, systematic, well written, focused, and critical. It also needs a good structure. With reviews, the usual subdivision of research papers into introduction, methods, results, and discussion does not work or is rarely used. However, a general introduction of the context and, toward the end, a recapitulation of the main points covered and take-home messages make sense also in the case of reviews. For systematic reviews, there is a trend towards including information about how the literature was searched (database, keywords, time limits) [20] .

How can you organize the flow of the main body of the review so that the reader will be drawn into and guided through it? It is generally helpful to draw a conceptual scheme of the review, e.g., with mind-mapping techniques. Such diagrams can help recognize a logical way to order and link the various sections of a review [21] . This is the case not just at the writing stage, but also for readers if the diagram is included in the review as a figure. A careful selection of diagrams and figures relevant to the reviewed topic can be very helpful to structure the text too [22] .

Rule 8: Make Use of Feedback

Reviews of the literature are normally peer-reviewed in the same way as research papers, and rightly so [23] . As a rule, incorporating feedback from reviewers greatly helps improve a review draft. Having read the review with a fresh mind, reviewers may spot inaccuracies, inconsistencies, and ambiguities that had not been noticed by the writers due to rereading the typescript too many times. It is however advisable to reread the draft one more time before submission, as a last-minute correction of typos, leaps, and muddled sentences may enable the reviewers to focus on providing advice on the content rather than the form.

Feedback is vital to writing a good review, and should be sought from a variety of colleagues, so as to obtain a diversity of views on the draft. This may lead in some cases to conflicting views on the merits of the paper, and on how to improve it, but such a situation is better than the absence of feedback. A diversity of feedback perspectives on a literature review can help identify where the consensus view stands in the landscape of the current scientific understanding of an issue [24] .

Rule 9: Include Your Own Relevant Research, but Be Objective

In many cases, reviewers of the literature will have published studies relevant to the review they are writing. This could create a conflict of interest: how can reviewers report objectively on their own work [25] ? Some scientists may be overly enthusiastic about what they have published, and thus risk giving too much importance to their own findings in the review. However, bias could also occur in the other direction: some scientists may be unduly dismissive of their own achievements, so that they will tend to downplay their contribution (if any) to a field when reviewing it.

In general, a review of the literature should neither be a public relations brochure nor an exercise in competitive self-denial. If a reviewer is up to the job of producing a well-organized and methodical review, which flows well and provides a service to the readership, then it should be possible to be objective in reviewing one's own relevant findings. In reviews written by multiple authors, this may be achieved by assigning the review of the results of a coauthor to different coauthors.

Rule 10: Be Up-to-Date, but Do Not Forget Older Studies

Given the progressive acceleration in the publication of scientific papers, today's reviews of the literature need awareness not just of the overall direction and achievements of a field of inquiry, but also of the latest studies, so as not to become out-of-date before they have been published. Ideally, a literature review should not identify as a major research gap an issue that has just been addressed in a series of papers in press (the same applies, of course, to older, overlooked studies (“sleeping beauties” [26] )). This implies that literature reviewers would do well to keep an eye on electronic lists of papers in press, given that it can take months before these appear in scientific databases. Some reviews declare that they have scanned the literature up to a certain point in time, but given that peer review can be a rather lengthy process, a full search for newly appeared literature at the revision stage may be worthwhile. Assessing the contribution of papers that have just appeared is particularly challenging, because there is little perspective with which to gauge their significance and impact on further research and society.

Inevitably, new papers on the reviewed topic (including independently written literature reviews) will appear from all quarters after the review has been published, so that there may soon be the need for an updated review. But this is the nature of science [27] – [32] . I wish everybody good luck with writing a review of the literature.

Acknowledgments

Many thanks to M. Barbosa, K. Dehnen-Schmutz, T. Döring, D. Fontaneto, M. Garbelotto, O. Holdenrieder, M. Jeger, D. Lonsdale, A. MacLeod, P. Mills, M. Moslonka-Lefebvre, G. Stancanelli, P. Weisberg, and X. Xu for insights and discussions, and to P. Bourne, T. Matoni, and D. Smith for helpful comments on a previous draft.

Funding Statement

This work was funded by the French Foundation for Research on Biodiversity (FRB) through its Centre for Synthesis and Analysis of Biodiversity data (CESAB), as part of the NETSEED research project. The funders had no role in the preparation of the manuscript.

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A literature review surveys prior research published in books, scholarly articles, and any other sources relevant to a particular issue, area of research, or theory, and by so doing, provides a description, summary, and critical evaluation of these works in relation to the research problem being investigated. Literature reviews are designed to provide an overview of sources you have used in researching a particular topic and to demonstrate to your readers how your research fits within existing scholarship about the topic.

Fink, Arlene. Conducting Research Literature Reviews: From the Internet to Paper . Fourth edition. Thousand Oaks, CA: SAGE, 2014.

Importance of a Good Literature Review

A literature review may consist of simply a summary of key sources, but in the social sciences, a literature review usually has an organizational pattern and combines both summary and synthesis, often within specific conceptual categories . A summary is a recap of the important information of the source, but a synthesis is a re-organization, or a reshuffling, of that information in a way that informs how you are planning to investigate a research problem. The analytical features of a literature review might:

  • Give a new interpretation of old material or combine new with old interpretations,
  • Trace the intellectual progression of the field, including major debates,
  • Depending on the situation, evaluate the sources and advise the reader on the most pertinent or relevant research, or
  • Usually in the conclusion of a literature review, identify where gaps exist in how a problem has been researched to date.

Given this, the purpose of a literature review is to:

  • Place each work in the context of its contribution to understanding the research problem being studied.
  • Describe the relationship of each work to the others under consideration.
  • Identify new ways to interpret prior research.
  • Reveal any gaps that exist in the literature.
  • Resolve conflicts amongst seemingly contradictory previous studies.
  • Identify areas of prior scholarship to prevent duplication of effort.
  • Point the way in fulfilling a need for additional research.
  • Locate your own research within the context of existing literature [very important].

Fink, Arlene. Conducting Research Literature Reviews: From the Internet to Paper. 2nd ed. Thousand Oaks, CA: Sage, 2005; Hart, Chris. Doing a Literature Review: Releasing the Social Science Research Imagination . Thousand Oaks, CA: Sage Publications, 1998; Jesson, Jill. Doing Your Literature Review: Traditional and Systematic Techniques . Los Angeles, CA: SAGE, 2011; Knopf, Jeffrey W. "Doing a Literature Review." PS: Political Science and Politics 39 (January 2006): 127-132; Ridley, Diana. The Literature Review: A Step-by-Step Guide for Students . 2nd ed. Los Angeles, CA: SAGE, 2012.

Types of Literature Reviews

It is important to think of knowledge in a given field as consisting of three layers. First, there are the primary studies that researchers conduct and publish. Second are the reviews of those studies that summarize and offer new interpretations built from and often extending beyond the primary studies. Third, there are the perceptions, conclusions, opinion, and interpretations that are shared informally among scholars that become part of the body of epistemological traditions within the field.

In composing a literature review, it is important to note that it is often this third layer of knowledge that is cited as "true" even though it often has only a loose relationship to the primary studies and secondary literature reviews. Given this, while literature reviews are designed to provide an overview and synthesis of pertinent sources you have explored, there are a number of approaches you could adopt depending upon the type of analysis underpinning your study.

Argumentative Review This form examines literature selectively in order to support or refute an argument, deeply embedded assumption, or philosophical problem already established in the literature. The purpose is to develop a body of literature that establishes a contrarian viewpoint. Given the value-laden nature of some social science research [e.g., educational reform; immigration control], argumentative approaches to analyzing the literature can be a legitimate and important form of discourse. However, note that they can also introduce problems of bias when they are used to make summary claims of the sort found in systematic reviews [see below].

Integrative Review Considered a form of research that reviews, critiques, and synthesizes representative literature on a topic in an integrated way such that new frameworks and perspectives on the topic are generated. The body of literature includes all studies that address related or identical hypotheses or research problems. A well-done integrative review meets the same standards as primary research in regard to clarity, rigor, and replication. This is the most common form of review in the social sciences.

Historical Review Few things rest in isolation from historical precedent. Historical literature reviews focus on examining research throughout a period of time, often starting with the first time an issue, concept, theory, phenomena emerged in the literature, then tracing its evolution within the scholarship of a discipline. The purpose is to place research in a historical context to show familiarity with state-of-the-art developments and to identify the likely directions for future research.

Methodological Review A review does not always focus on what someone said [findings], but how they came about saying what they say [method of analysis]. Reviewing methods of analysis provides a framework of understanding at different levels [i.e. those of theory, substantive fields, research approaches, and data collection and analysis techniques], how researchers draw upon a wide variety of knowledge ranging from the conceptual level to practical documents for use in fieldwork in the areas of ontological and epistemological consideration, quantitative and qualitative integration, sampling, interviewing, data collection, and data analysis. This approach helps highlight ethical issues which you should be aware of and consider as you go through your own study.

Systematic Review This form consists of an overview of existing evidence pertinent to a clearly formulated research question, which uses pre-specified and standardized methods to identify and critically appraise relevant research, and to collect, report, and analyze data from the studies that are included in the review. The goal is to deliberately document, critically evaluate, and summarize scientifically all of the research about a clearly defined research problem . Typically it focuses on a very specific empirical question, often posed in a cause-and-effect form, such as "To what extent does A contribute to B?" This type of literature review is primarily applied to examining prior research studies in clinical medicine and allied health fields, but it is increasingly being used in the social sciences.

Theoretical Review The purpose of this form is to examine the corpus of theory that has accumulated in regard to an issue, concept, theory, phenomena. The theoretical literature review helps to establish what theories already exist, the relationships between them, to what degree the existing theories have been investigated, and to develop new hypotheses to be tested. Often this form is used to help establish a lack of appropriate theories or reveal that current theories are inadequate for explaining new or emerging research problems. The unit of analysis can focus on a theoretical concept or a whole theory or framework.

NOTE : Most often the literature review will incorporate some combination of types. For example, a review that examines literature supporting or refuting an argument, assumption, or philosophical problem related to the research problem will also need to include writing supported by sources that establish the history of these arguments in the literature.

Baumeister, Roy F. and Mark R. Leary. "Writing Narrative Literature Reviews."  Review of General Psychology 1 (September 1997): 311-320; Mark R. Fink, Arlene. Conducting Research Literature Reviews: From the Internet to Paper . 2nd ed. Thousand Oaks, CA: Sage, 2005; Hart, Chris. Doing a Literature Review: Releasing the Social Science Research Imagination . Thousand Oaks, CA: Sage Publications, 1998; Kennedy, Mary M. "Defining a Literature." Educational Researcher 36 (April 2007): 139-147; Petticrew, Mark and Helen Roberts. Systematic Reviews in the Social Sciences: A Practical Guide . Malden, MA: Blackwell Publishers, 2006; Torracro, Richard. "Writing Integrative Literature Reviews: Guidelines and Examples." Human Resource Development Review 4 (September 2005): 356-367; Rocco, Tonette S. and Maria S. Plakhotnik. "Literature Reviews, Conceptual Frameworks, and Theoretical Frameworks: Terms, Functions, and Distinctions." Human Ressource Development Review 8 (March 2008): 120-130; Sutton, Anthea. Systematic Approaches to a Successful Literature Review . Los Angeles, CA: Sage Publications, 2016.

Structure and Writing Style

I.  Thinking About Your Literature Review

The structure of a literature review should include the following in support of understanding the research problem :

  • An overview of the subject, issue, or theory under consideration, along with the objectives of the literature review,
  • Division of works under review into themes or categories [e.g. works that support a particular position, those against, and those offering alternative approaches entirely],
  • An explanation of how each work is similar to and how it varies from the others,
  • Conclusions as to which pieces are best considered in their argument, are most convincing of their opinions, and make the greatest contribution to the understanding and development of their area of research.

The critical evaluation of each work should consider :

  • Provenance -- what are the author's credentials? Are the author's arguments supported by evidence [e.g. primary historical material, case studies, narratives, statistics, recent scientific findings]?
  • Methodology -- were the techniques used to identify, gather, and analyze the data appropriate to addressing the research problem? Was the sample size appropriate? Were the results effectively interpreted and reported?
  • Objectivity -- is the author's perspective even-handed or prejudicial? Is contrary data considered or is certain pertinent information ignored to prove the author's point?
  • Persuasiveness -- which of the author's theses are most convincing or least convincing?
  • Validity -- are the author's arguments and conclusions convincing? Does the work ultimately contribute in any significant way to an understanding of the subject?

II.  Development of the Literature Review

Four Basic Stages of Writing 1.  Problem formulation -- which topic or field is being examined and what are its component issues? 2.  Literature search -- finding materials relevant to the subject being explored. 3.  Data evaluation -- determining which literature makes a significant contribution to the understanding of the topic. 4.  Analysis and interpretation -- discussing the findings and conclusions of pertinent literature.

Consider the following issues before writing the literature review: Clarify If your assignment is not specific about what form your literature review should take, seek clarification from your professor by asking these questions: 1.  Roughly how many sources would be appropriate to include? 2.  What types of sources should I review (books, journal articles, websites; scholarly versus popular sources)? 3.  Should I summarize, synthesize, or critique sources by discussing a common theme or issue? 4.  Should I evaluate the sources in any way beyond evaluating how they relate to understanding the research problem? 5.  Should I provide subheadings and other background information, such as definitions and/or a history? Find Models Use the exercise of reviewing the literature to examine how authors in your discipline or area of interest have composed their literature review sections. Read them to get a sense of the types of themes you might want to look for in your own research or to identify ways to organize your final review. The bibliography or reference section of sources you've already read, such as required readings in the course syllabus, are also excellent entry points into your own research. Narrow the Topic The narrower your topic, the easier it will be to limit the number of sources you need to read in order to obtain a good survey of relevant resources. Your professor will probably not expect you to read everything that's available about the topic, but you'll make the act of reviewing easier if you first limit scope of the research problem. A good strategy is to begin by searching the USC Libraries Catalog for recent books about the topic and review the table of contents for chapters that focuses on specific issues. You can also review the indexes of books to find references to specific issues that can serve as the focus of your research. For example, a book surveying the history of the Israeli-Palestinian conflict may include a chapter on the role Egypt has played in mediating the conflict, or look in the index for the pages where Egypt is mentioned in the text. Consider Whether Your Sources are Current Some disciplines require that you use information that is as current as possible. This is particularly true in disciplines in medicine and the sciences where research conducted becomes obsolete very quickly as new discoveries are made. However, when writing a review in the social sciences, a survey of the history of the literature may be required. In other words, a complete understanding the research problem requires you to deliberately examine how knowledge and perspectives have changed over time. Sort through other current bibliographies or literature reviews in the field to get a sense of what your discipline expects. You can also use this method to explore what is considered by scholars to be a "hot topic" and what is not.

III.  Ways to Organize Your Literature Review

Chronology of Events If your review follows the chronological method, you could write about the materials according to when they were published. This approach should only be followed if a clear path of research building on previous research can be identified and that these trends follow a clear chronological order of development. For example, a literature review that focuses on continuing research about the emergence of German economic power after the fall of the Soviet Union. By Publication Order your sources by publication chronology, then, only if the order demonstrates a more important trend. For instance, you could order a review of literature on environmental studies of brown fields if the progression revealed, for example, a change in the soil collection practices of the researchers who wrote and/or conducted the studies. Thematic [“conceptual categories”] A thematic literature review is the most common approach to summarizing prior research in the social and behavioral sciences. Thematic reviews are organized around a topic or issue, rather than the progression of time, although the progression of time may still be incorporated into a thematic review. For example, a review of the Internet’s impact on American presidential politics could focus on the development of online political satire. While the study focuses on one topic, the Internet’s impact on American presidential politics, it would still be organized chronologically reflecting technological developments in media. The difference in this example between a "chronological" and a "thematic" approach is what is emphasized the most: themes related to the role of the Internet in presidential politics. Note that more authentic thematic reviews tend to break away from chronological order. A review organized in this manner would shift between time periods within each section according to the point being made. Methodological A methodological approach focuses on the methods utilized by the researcher. For the Internet in American presidential politics project, one methodological approach would be to look at cultural differences between the portrayal of American presidents on American, British, and French websites. Or the review might focus on the fundraising impact of the Internet on a particular political party. A methodological scope will influence either the types of documents in the review or the way in which these documents are discussed.

Other Sections of Your Literature Review Once you've decided on the organizational method for your literature review, the sections you need to include in the paper should be easy to figure out because they arise from your organizational strategy. In other words, a chronological review would have subsections for each vital time period; a thematic review would have subtopics based upon factors that relate to the theme or issue. However, sometimes you may need to add additional sections that are necessary for your study, but do not fit in the organizational strategy of the body. What other sections you include in the body is up to you. However, only include what is necessary for the reader to locate your study within the larger scholarship about the research problem.

Here are examples of other sections, usually in the form of a single paragraph, you may need to include depending on the type of review you write:

  • Current Situation : Information necessary to understand the current topic or focus of the literature review.
  • Sources Used : Describes the methods and resources [e.g., databases] you used to identify the literature you reviewed.
  • History : The chronological progression of the field, the research literature, or an idea that is necessary to understand the literature review, if the body of the literature review is not already a chronology.
  • Selection Methods : Criteria you used to select (and perhaps exclude) sources in your literature review. For instance, you might explain that your review includes only peer-reviewed [i.e., scholarly] sources.
  • Standards : Description of the way in which you present your information.
  • Questions for Further Research : What questions about the field has the review sparked? How will you further your research as a result of the review?

IV.  Writing Your Literature Review

Once you've settled on how to organize your literature review, you're ready to write each section. When writing your review, keep in mind these issues.

Use Evidence A literature review section is, in this sense, just like any other academic research paper. Your interpretation of the available sources must be backed up with evidence [citations] that demonstrates that what you are saying is valid. Be Selective Select only the most important points in each source to highlight in the review. The type of information you choose to mention should relate directly to the research problem, whether it is thematic, methodological, or chronological. Related items that provide additional information, but that are not key to understanding the research problem, can be included in a list of further readings . Use Quotes Sparingly Some short quotes are appropriate if you want to emphasize a point, or if what an author stated cannot be easily paraphrased. Sometimes you may need to quote certain terminology that was coined by the author, is not common knowledge, or taken directly from the study. Do not use extensive quotes as a substitute for using your own words in reviewing the literature. Summarize and Synthesize Remember to summarize and synthesize your sources within each thematic paragraph as well as throughout the review. Recapitulate important features of a research study, but then synthesize it by rephrasing the study's significance and relating it to your own work and the work of others. Keep Your Own Voice While the literature review presents others' ideas, your voice [the writer's] should remain front and center. For example, weave references to other sources into what you are writing but maintain your own voice by starting and ending the paragraph with your own ideas and wording. Use Caution When Paraphrasing When paraphrasing a source that is not your own, be sure to represent the author's information or opinions accurately and in your own words. Even when paraphrasing an author’s work, you still must provide a citation to that work.

V.  Common Mistakes to Avoid

These are the most common mistakes made in reviewing social science research literature.

  • Sources in your literature review do not clearly relate to the research problem;
  • You do not take sufficient time to define and identify the most relevant sources to use in the literature review related to the research problem;
  • Relies exclusively on secondary analytical sources rather than including relevant primary research studies or data;
  • Uncritically accepts another researcher's findings and interpretations as valid, rather than examining critically all aspects of the research design and analysis;
  • Does not describe the search procedures that were used in identifying the literature to review;
  • Reports isolated statistical results rather than synthesizing them in chi-squared or meta-analytic methods; and,
  • Only includes research that validates assumptions and does not consider contrary findings and alternative interpretations found in the literature.

Cook, Kathleen E. and Elise Murowchick. “Do Literature Review Skills Transfer from One Course to Another?” Psychology Learning and Teaching 13 (March 2014): 3-11; Fink, Arlene. Conducting Research Literature Reviews: From the Internet to Paper . 2nd ed. Thousand Oaks, CA: Sage, 2005; Hart, Chris. Doing a Literature Review: Releasing the Social Science Research Imagination . Thousand Oaks, CA: Sage Publications, 1998; Jesson, Jill. Doing Your Literature Review: Traditional and Systematic Techniques . London: SAGE, 2011; Literature Review Handout. Online Writing Center. Liberty University; Literature Reviews. The Writing Center. University of North Carolina; Onwuegbuzie, Anthony J. and Rebecca Frels. Seven Steps to a Comprehensive Literature Review: A Multimodal and Cultural Approach . Los Angeles, CA: SAGE, 2016; Ridley, Diana. The Literature Review: A Step-by-Step Guide for Students . 2nd ed. Los Angeles, CA: SAGE, 2012; Randolph, Justus J. “A Guide to Writing the Dissertation Literature Review." Practical Assessment, Research, and Evaluation. vol. 14, June 2009; Sutton, Anthea. Systematic Approaches to a Successful Literature Review . Los Angeles, CA: Sage Publications, 2016; Taylor, Dena. The Literature Review: A Few Tips On Conducting It. University College Writing Centre. University of Toronto; Writing a Literature Review. Academic Skills Centre. University of Canberra.

Writing Tip

Break Out of Your Disciplinary Box!

Thinking interdisciplinarily about a research problem can be a rewarding exercise in applying new ideas, theories, or concepts to an old problem. For example, what might cultural anthropologists say about the continuing conflict in the Middle East? In what ways might geographers view the need for better distribution of social service agencies in large cities than how social workers might study the issue? You don’t want to substitute a thorough review of core research literature in your discipline for studies conducted in other fields of study. However, particularly in the social sciences, thinking about research problems from multiple vectors is a key strategy for finding new solutions to a problem or gaining a new perspective. Consult with a librarian about identifying research databases in other disciplines; almost every field of study has at least one comprehensive database devoted to indexing its research literature.

Frodeman, Robert. The Oxford Handbook of Interdisciplinarity . New York: Oxford University Press, 2010.

Another Writing Tip

Don't Just Review for Content!

While conducting a review of the literature, maximize the time you devote to writing this part of your paper by thinking broadly about what you should be looking for and evaluating. Review not just what scholars are saying, but how are they saying it. Some questions to ask:

  • How are they organizing their ideas?
  • What methods have they used to study the problem?
  • What theories have been used to explain, predict, or understand their research problem?
  • What sources have they cited to support their conclusions?
  • How have they used non-textual elements [e.g., charts, graphs, figures, etc.] to illustrate key points?

When you begin to write your literature review section, you'll be glad you dug deeper into how the research was designed and constructed because it establishes a means for developing more substantial analysis and interpretation of the research problem.

Hart, Chris. Doing a Literature Review: Releasing the Social Science Research Imagination . Thousand Oaks, CA: Sage Publications, 1 998.

Yet Another Writing Tip

When Do I Know I Can Stop Looking and Move On?

Here are several strategies you can utilize to assess whether you've thoroughly reviewed the literature:

  • Look for repeating patterns in the research findings . If the same thing is being said, just by different people, then this likely demonstrates that the research problem has hit a conceptual dead end. At this point consider: Does your study extend current research?  Does it forge a new path? Or, does is merely add more of the same thing being said?
  • Look at sources the authors cite to in their work . If you begin to see the same researchers cited again and again, then this is often an indication that no new ideas have been generated to address the research problem.
  • Search Google Scholar to identify who has subsequently cited leading scholars already identified in your literature review [see next sub-tab]. This is called citation tracking and there are a number of sources that can help you identify who has cited whom, particularly scholars from outside of your discipline. Here again, if the same authors are being cited again and again, this may indicate no new literature has been written on the topic.

Onwuegbuzie, Anthony J. and Rebecca Frels. Seven Steps to a Comprehensive Literature Review: A Multimodal and Cultural Approach . Los Angeles, CA: Sage, 2016; Sutton, Anthea. Systematic Approaches to a Successful Literature Review . Los Angeles, CA: Sage Publications, 2016.

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What is a Literature Review? How to Write It (with Examples)

literature review

A literature review is a critical analysis and synthesis of existing research on a particular topic. It provides an overview of the current state of knowledge, identifies gaps, and highlights key findings in the literature. 1 The purpose of a literature review is to situate your own research within the context of existing scholarship, demonstrating your understanding of the topic and showing how your work contributes to the ongoing conversation in the field. Learning how to write a literature review is a critical tool for successful research. Your ability to summarize and synthesize prior research pertaining to a certain topic demonstrates your grasp on the topic of study, and assists in the learning process. 

Table of Contents

  • What is the purpose of literature review? 
  • a. Habitat Loss and Species Extinction: 
  • b. Range Shifts and Phenological Changes: 
  • c. Ocean Acidification and Coral Reefs: 
  • d. Adaptive Strategies and Conservation Efforts: 
  • How to write a good literature review 
  • Choose a Topic and Define the Research Question: 
  • Decide on the Scope of Your Review: 
  • Select Databases for Searches: 
  • Conduct Searches and Keep Track: 
  • Review the Literature: 
  • Organize and Write Your Literature Review: 
  • Frequently asked questions 

What is a literature review?

A well-conducted literature review demonstrates the researcher’s familiarity with the existing literature, establishes the context for their own research, and contributes to scholarly conversations on the topic. One of the purposes of a literature review is also to help researchers avoid duplicating previous work and ensure that their research is informed by and builds upon the existing body of knowledge.

books on literature review

What is the purpose of literature review?

A literature review serves several important purposes within academic and research contexts. Here are some key objectives and functions of a literature review: 2  

  • Contextualizing the Research Problem: The literature review provides a background and context for the research problem under investigation. It helps to situate the study within the existing body of knowledge. 
  • Identifying Gaps in Knowledge: By identifying gaps, contradictions, or areas requiring further research, the researcher can shape the research question and justify the significance of the study. This is crucial for ensuring that the new research contributes something novel to the field. 
  • Understanding Theoretical and Conceptual Frameworks: Literature reviews help researchers gain an understanding of the theoretical and conceptual frameworks used in previous studies. This aids in the development of a theoretical framework for the current research. 
  • Providing Methodological Insights: Another purpose of literature reviews is that it allows researchers to learn about the methodologies employed in previous studies. This can help in choosing appropriate research methods for the current study and avoiding pitfalls that others may have encountered. 
  • Establishing Credibility: A well-conducted literature review demonstrates the researcher’s familiarity with existing scholarship, establishing their credibility and expertise in the field. It also helps in building a solid foundation for the new research. 
  • Informing Hypotheses or Research Questions: The literature review guides the formulation of hypotheses or research questions by highlighting relevant findings and areas of uncertainty in existing literature. 

Literature review example

Let’s delve deeper with a literature review example: Let’s say your literature review is about the impact of climate change on biodiversity. You might format your literature review into sections such as the effects of climate change on habitat loss and species extinction, phenological changes, and marine biodiversity. Each section would then summarize and analyze relevant studies in those areas, highlighting key findings and identifying gaps in the research. The review would conclude by emphasizing the need for further research on specific aspects of the relationship between climate change and biodiversity. The following literature review template provides a glimpse into the recommended literature review structure and content, demonstrating how research findings are organized around specific themes within a broader topic. 

Literature Review on Climate Change Impacts on Biodiversity:

Climate change is a global phenomenon with far-reaching consequences, including significant impacts on biodiversity. This literature review synthesizes key findings from various studies: 

a. Habitat Loss and Species Extinction:

Climate change-induced alterations in temperature and precipitation patterns contribute to habitat loss, affecting numerous species (Thomas et al., 2004). The review discusses how these changes increase the risk of extinction, particularly for species with specific habitat requirements. 

b. Range Shifts and Phenological Changes:

Observations of range shifts and changes in the timing of biological events (phenology) are documented in response to changing climatic conditions (Parmesan & Yohe, 2003). These shifts affect ecosystems and may lead to mismatches between species and their resources. 

c. Ocean Acidification and Coral Reefs:

The review explores the impact of climate change on marine biodiversity, emphasizing ocean acidification’s threat to coral reefs (Hoegh-Guldberg et al., 2007). Changes in pH levels negatively affect coral calcification, disrupting the delicate balance of marine ecosystems. 

d. Adaptive Strategies and Conservation Efforts:

Recognizing the urgency of the situation, the literature review discusses various adaptive strategies adopted by species and conservation efforts aimed at mitigating the impacts of climate change on biodiversity (Hannah et al., 2007). It emphasizes the importance of interdisciplinary approaches for effective conservation planning. 

books on literature review

How to write a good literature review

Writing a literature review involves summarizing and synthesizing existing research on a particular topic. A good literature review format should include the following elements. 

Introduction: The introduction sets the stage for your literature review, providing context and introducing the main focus of your review. 

  • Opening Statement: Begin with a general statement about the broader topic and its significance in the field. 
  • Scope and Purpose: Clearly define the scope of your literature review. Explain the specific research question or objective you aim to address. 
  • Organizational Framework: Briefly outline the structure of your literature review, indicating how you will categorize and discuss the existing research. 
  • Significance of the Study: Highlight why your literature review is important and how it contributes to the understanding of the chosen topic. 
  • Thesis Statement: Conclude the introduction with a concise thesis statement that outlines the main argument or perspective you will develop in the body of the literature review. 

Body: The body of the literature review is where you provide a comprehensive analysis of existing literature, grouping studies based on themes, methodologies, or other relevant criteria. 

  • Organize by Theme or Concept: Group studies that share common themes, concepts, or methodologies. Discuss each theme or concept in detail, summarizing key findings and identifying gaps or areas of disagreement. 
  • Critical Analysis: Evaluate the strengths and weaknesses of each study. Discuss the methodologies used, the quality of evidence, and the overall contribution of each work to the understanding of the topic. 
  • Synthesis of Findings: Synthesize the information from different studies to highlight trends, patterns, or areas of consensus in the literature. 
  • Identification of Gaps: Discuss any gaps or limitations in the existing research and explain how your review contributes to filling these gaps. 
  • Transition between Sections: Provide smooth transitions between different themes or concepts to maintain the flow of your literature review. 

Conclusion: The conclusion of your literature review should summarize the main findings, highlight the contributions of the review, and suggest avenues for future research. 

  • Summary of Key Findings: Recap the main findings from the literature and restate how they contribute to your research question or objective. 
  • Contributions to the Field: Discuss the overall contribution of your literature review to the existing knowledge in the field. 
  • Implications and Applications: Explore the practical implications of the findings and suggest how they might impact future research or practice. 
  • Recommendations for Future Research: Identify areas that require further investigation and propose potential directions for future research in the field. 
  • Final Thoughts: Conclude with a final reflection on the importance of your literature review and its relevance to the broader academic community. 

what is a literature review

Conducting a literature review

Conducting a literature review is an essential step in research that involves reviewing and analyzing existing literature on a specific topic. It’s important to know how to do a literature review effectively, so here are the steps to follow: 1  

Choose a Topic and Define the Research Question:

  • Select a topic that is relevant to your field of study. 
  • Clearly define your research question or objective. Determine what specific aspect of the topic do you want to explore? 

Decide on the Scope of Your Review:

  • Determine the timeframe for your literature review. Are you focusing on recent developments, or do you want a historical overview? 
  • Consider the geographical scope. Is your review global, or are you focusing on a specific region? 
  • Define the inclusion and exclusion criteria. What types of sources will you include? Are there specific types of studies or publications you will exclude? 

Select Databases for Searches:

  • Identify relevant databases for your field. Examples include PubMed, IEEE Xplore, Scopus, Web of Science, and Google Scholar. 
  • Consider searching in library catalogs, institutional repositories, and specialized databases related to your topic. 

Conduct Searches and Keep Track:

  • Develop a systematic search strategy using keywords, Boolean operators (AND, OR, NOT), and other search techniques. 
  • Record and document your search strategy for transparency and replicability. 
  • Keep track of the articles, including publication details, abstracts, and links. Use citation management tools like EndNote, Zotero, or Mendeley to organize your references. 

Review the Literature:

  • Evaluate the relevance and quality of each source. Consider the methodology, sample size, and results of studies. 
  • Organize the literature by themes or key concepts. Identify patterns, trends, and gaps in the existing research. 
  • Summarize key findings and arguments from each source. Compare and contrast different perspectives. 
  • Identify areas where there is a consensus in the literature and where there are conflicting opinions. 
  • Provide critical analysis and synthesis of the literature. What are the strengths and weaknesses of existing research? 

Organize and Write Your Literature Review:

  • Literature review outline should be based on themes, chronological order, or methodological approaches. 
  • Write a clear and coherent narrative that synthesizes the information gathered. 
  • Use proper citations for each source and ensure consistency in your citation style (APA, MLA, Chicago, etc.). 
  • Conclude your literature review by summarizing key findings, identifying gaps, and suggesting areas for future research. 

The literature review sample and detailed advice on writing and conducting a review will help you produce a well-structured report. But remember that a literature review is an ongoing process, and it may be necessary to revisit and update it as your research progresses. 

Frequently asked questions

A literature review is a critical and comprehensive analysis of existing literature (published and unpublished works) on a specific topic or research question and provides a synthesis of the current state of knowledge in a particular field. A well-conducted literature review is crucial for researchers to build upon existing knowledge, avoid duplication of efforts, and contribute to the advancement of their field. It also helps researchers situate their work within a broader context and facilitates the development of a sound theoretical and conceptual framework for their studies.

Literature review is a crucial component of research writing, providing a solid background for a research paper’s investigation. The aim is to keep professionals up to date by providing an understanding of ongoing developments within a specific field, including research methods, and experimental techniques used in that field, and present that knowledge in the form of a written report. Also, the depth and breadth of the literature review emphasizes the credibility of the scholar in his or her field.  

Before writing a literature review, it’s essential to undertake several preparatory steps to ensure that your review is well-researched, organized, and focused. This includes choosing a topic of general interest to you and doing exploratory research on that topic, writing an annotated bibliography, and noting major points, especially those that relate to the position you have taken on the topic. 

Literature reviews and academic research papers are essential components of scholarly work but serve different purposes within the academic realm. 3 A literature review aims to provide a foundation for understanding the current state of research on a particular topic, identify gaps or controversies, and lay the groundwork for future research. Therefore, it draws heavily from existing academic sources, including books, journal articles, and other scholarly publications. In contrast, an academic research paper aims to present new knowledge, contribute to the academic discourse, and advance the understanding of a specific research question. Therefore, it involves a mix of existing literature (in the introduction and literature review sections) and original data or findings obtained through research methods. 

Literature reviews are essential components of academic and research papers, and various strategies can be employed to conduct them effectively. If you want to know how to write a literature review for a research paper, here are four common approaches that are often used by researchers.  Chronological Review: This strategy involves organizing the literature based on the chronological order of publication. It helps to trace the development of a topic over time, showing how ideas, theories, and research have evolved.  Thematic Review: Thematic reviews focus on identifying and analyzing themes or topics that cut across different studies. Instead of organizing the literature chronologically, it is grouped by key themes or concepts, allowing for a comprehensive exploration of various aspects of the topic.  Methodological Review: This strategy involves organizing the literature based on the research methods employed in different studies. It helps to highlight the strengths and weaknesses of various methodologies and allows the reader to evaluate the reliability and validity of the research findings.  Theoretical Review: A theoretical review examines the literature based on the theoretical frameworks used in different studies. This approach helps to identify the key theories that have been applied to the topic and assess their contributions to the understanding of the subject.  It’s important to note that these strategies are not mutually exclusive, and a literature review may combine elements of more than one approach. The choice of strategy depends on the research question, the nature of the literature available, and the goals of the review. Additionally, other strategies, such as integrative reviews or systematic reviews, may be employed depending on the specific requirements of the research.

The literature review format can vary depending on the specific publication guidelines. However, there are some common elements and structures that are often followed. Here is a general guideline for the format of a literature review:  Introduction:   Provide an overview of the topic.  Define the scope and purpose of the literature review.  State the research question or objective.  Body:   Organize the literature by themes, concepts, or chronology.  Critically analyze and evaluate each source.  Discuss the strengths and weaknesses of the studies.  Highlight any methodological limitations or biases.  Identify patterns, connections, or contradictions in the existing research.  Conclusion:   Summarize the key points discussed in the literature review.  Highlight the research gap.  Address the research question or objective stated in the introduction.  Highlight the contributions of the review and suggest directions for future research.

Both annotated bibliographies and literature reviews involve the examination of scholarly sources. While annotated bibliographies focus on individual sources with brief annotations, literature reviews provide a more in-depth, integrated, and comprehensive analysis of existing literature on a specific topic. The key differences are as follows: 

References 

  • Denney, A. S., & Tewksbury, R. (2013). How to write a literature review.  Journal of criminal justice education ,  24 (2), 218-234. 
  • Pan, M. L. (2016).  Preparing literature reviews: Qualitative and quantitative approaches . Taylor & Francis. 
  • Cantero, C. (2019). How to write a literature review.  San José State University Writing Center . 

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  • What is a Book Review or Book Report?
  • What is a Literature Review?

Also referred to as a book report, a  book review  consists of "critical comments on a book, especially when it is first published" ("Book Review, 2006). 

Similar to a short essay, a book review typically includes several of these elements:

     •  Description of the book's main topic, purpose and/or point of view, answering questions such as:

            •  What is the genre of the work (i.e. novel, non-fiction, memoir etc.)?

            •  Who is the intended audience?

            •  If a fictional work, what are the key themes, motifs, and/or plot devices?

            •  If a non-fictional work, what are the main arguments and ideas?

      •  Assessment of the book's main points, biases or flaws

      •  Critical analysis of the book's strengths and weaknesses, literary value and/or overall quality and contribution to the subject area

      •  If non-fiction, an explanation of how the book fits into the academic or popular discourse on a topic or subject area

Book Review. (2006). In P. Collin (Ed.),  Dictionary of publishing and printing . London, United Kingdom: A&C Black. Retrieved from http://search.credoreference.com

Follow these links to learn more about book reviews:

  • Book Reviews - University of North Carolina at Chapel Hill
  • How to Write Book Reviews - Queens University
  • How to write a book report and a book review - Concordia University Libraries

A literature review is a "comprehensive study and interpretation of literature that addresses a specific topic" (Aveyard, 2010).

Literature reviews are generally conducted in one of two ways:

1) As a preliminary review before a larger study in order to critically evaluate the current literature and justify why further study and research is required.

In this case, the researcher must "systematically search, critique and combine the literature to demonstrate a gap in the existing research base" while demonstrating "their understanding of both the research and the methods previously used to investigate the area" (Aveyard, 2010).

2) As a project in itself that provides a comprehensive survey of the works published in a particular discipline or area of research over a specified period of time.

Sometimes referred to as a systematic literature review or meta-analysis, this type of literature review is a critical survey that attempts to "evaluate and interpret all available research evidence relevant to a particular question" (Glasziou, 2001).

Aveyard, H. (2010). Doing a literature review in health and social care: A practical guide (2nd ed.). Bershire, United Kingdom: Open University Press.

Galsziou, P. (2001). Systematic reviews in health care: A practical guide . New York, NY: Cambridge University Press.

Learn more about literature reviews:

  • Guidelines for writing a literature review - University of Minnesota Duluth A step-by-step guide for writing a literature review
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IN CONVERSATION

Lauren oyler wishes you’d fact-check your reviews, by steven phillips-horst, april 9, 2024.

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Lauren Oyler, photographed by Carleen Coulter.

I first discovered Lauren Oyler , as many did, when I read her scathing review of Jia Tolentino’s essay collection Trick Mirror in LRB. Tolentino was a writer I felt got too much credit for making facile observations, and I whispered as much to other writers I knew. That Oyler had the temerity to slaughter a sacred cow was a sign she was in the trenches with the rest of us. The people’s critic now has her own essay collection, No Judgment , a flirtatious meditation on criticism itself. Covering material relevant to tri-coastal freelancers (Gawker, autofiction, speaking English in Berlin), it reads like a vape-smoke filled teacher’s lounge for writers, with its meta-references to being a book (the final chapter is titled “TK KICKER”—editor parlance for “poignant little ending pending.”) If you, as I do, endeavor for others to read your occasional essays and come away thinking “wow, what a hilarious genius!” then you will appreciate the intimacy on hand. To mark the occasion, Oyler spoke with me from her parents’ home in West Virginia, where we discussed forbidden words, bad reviews, and trolling your audience. 

LAUREN OYLER: Hi, nice to meet you.

STEVEN PHILLIPS-HORST: Very nice to meet you.

OYLER: I’m in West Virginia, so this is the trash room. That’s why there’s trash behind me.

PHILLIPS-HORST: I was imagining something really authentically West Virginia, with squirrels running in the background and dad on the porch with the shotgun.

OYLER: No. I find people ask me about West Virginia very rarely, and when they do I’m like, “Oh, it sucks and it’s been ruined by corporate greed and politicians.” It’s not particularly beautiful where I live. You say that and people from West Virginia and rural America get mad at you because they’re like, “You don’t know what it’s like.” And I’m like, “I do know what it’s like, and that’s why I don’t live there.” They’ll never vote for better healthcare because they don’t want to admit that the healthcare they have is destroying their lives and terrible or anything like that. 

PHILLIPS-HORST: They don’t see the exurban, sad, dissociative wasteland around them, the 12-lane highway they have to cross to get to the Starbucks.

OYLER: Yeah. And I mean, they haven’t been anywhere else, and that’s also the failure of the American government.

PHILLIPS-HORST: Well, now that we’ve been sufficiently coastal elitist and established our point of view, we can get into discussing this book. First of all, congratulations on your book.

OYLER: Thank you.

PHILLIPS-HORST: It’s really impressive. As Heidi Montag once said, “Congratulations to anyone who has ever written a book.” Now, you’ve written two.

OYLER: If I can do it, anybody can do it. I’m from West Virginia.

PHILLIPS-HORST: When you first announced it, I remember you were like, “All the essays haven’t been published anywhere else first.” Often, when you come out with a book of essays, some of these works have previously been published in The New Yorker , et cetera.

OYLER: That was always my intention. Basically, I had three or four essays that I wanted to do for magazines, but then I got tired of writing for magazines. I especially didn’t want to write these essays for magazines because of those constraints that magazines often put on you.

PHILLIPS-HORST: They’re like, “It’s not newsy enough.” 

OYLER: Or they cut all the jokes, first things first.

PHILLIPS-HORST: Editors love to make a piece worse. No offense.

OYLER: I wanted to write these long, digressive pieces, and some of them are quite theoretical. With the anxiety essay, I was like, “No magazine is going to let me do a 4,000-word list of symptoms before I get to the point.” Right? I didn’t want my second book to be mostly pieces about other people’s writing, particularly because I am, for better or worse, so well-known for those negative book reviews. And personally, I sympathize with the consumer, and I am not going to buy a book that contains mostly material that I can read online for free. So that’s the rationale.

PHILLIPS-HORST: So, this is a book of criticism but it’s also about criticism. I assume that you’re reading the reviews.

OYLER: Mm-hmm.

PHILLIPS-HORST: There’s been some raves, there’s been some not raves. You’re sparking conversation. This is an aggressive question…

OYLER: I’m an aggressive person.

PHILLIPS-HORST: Do the not-raves make you question your entire previous career of writing not-raves?

PHILLIPS-HORST: You didn’t have a Seth Rogen moment like, “Wait a minute, I am vulnerable, I’m just a human. Maybe I shouldn’t have taken this person down”?

OYLER: No. When I write book reviews, I try to read the book as generously as I can and really engage with it. I also have a background in journalism, so I’m somewhat neurotic about getting things right. Some critics do not care so much about that, and that’s perfectly fine. But I fact-check my book reviews.

PHILLIPS-HORST: I do think criticism can be right or wrong. 

OYLER: Yeah, of course.

PHILLIPS-HORST: I mean, most elements of it can be. You can say, “This point they made feels wrong because they didn’t marshal sufficient evidence to support it” or “This particular turn of phrase is cliche.” Those can be true things that are somewhat unassailable.

OYLER: Also, if you cannot engage with my book in the actual arguments and substance of it in order to say something bad about it, why would I question what I’ve done? I think in general, I want to anticipate the flaws in my writing, and that’s what any serious writer should do if you want to try and get better.

PHILLIPS-HORST: I have a dream of writing a book of essays where one of the essays is a review of the book and one of the essays is a pan of the book and really emulate the style of a bitchy critic and a fawning critic. You have to own the story, you know?

OYLER: Yeah, you’ve got to own it. There’s so much in the book that’s about what we expect of public figures, what is a public figure, what are the ethics of gossip, what are the ethics of criticism, and in the context of social media? And I do try to walk the walk, which is to say, “If I want people to pay attention to me, then I have to accept the unfortunate drawbacks of that situation.”

PHILLIPS-HORST: You have to put on your gloves and get in the ring.

OYLER: There’s one paragraph in the book, it’s the only intentionally provocative paragraph I’ve ever written. 

PHILLIPS-HORST: I think I know what paragraph you’re talking about.

OYLER: Literally the headline is “Elitism.” And that’s why I’m going like, “Listen to all this elitist stuff that I do.” And it’s really interesting to see who falls for that, because I thought we knew what trolling was and had sort of moved past this irony vs. sincerity conversation.

PHILLIPS-HORST: I’m so into that, because I actually wrote, “I thought the Goodreads chapter felt like bait.” You basically paint this picture of a community of plebe reviewers drunk with power, ready to cancel anything that has a whiff of politics they disagree with. And then after you’ve set up this horde of unwashed masses, these keyboard warriors who are complete idiots, you have a whole section where you’re like, “Oh, and I’m a total elitist.” It’s so funny to see the real pans of your book all glob onto that paragraph. “She admitted it! She said it!”

OYLER: It’s also just funny to trick people into embarrassing themselves. Maybe some of them watch more TV than others, but we all more or less went to Ivy League schools, so it’s not exactly a scandal. But I do think it has something to do with my tone, which I have thought a lot about and will not be changing. There’s this ironic voice that I use sometimes that allows me to say, “Isn’t it funny I went to an Ivy League school?” And I think that’s disarming, because you’re not actually supposed to say that, right?

PHILLIPS-HORST: You’re supposed to be ashamed or embarrassed.

OYLER: Yeah, you’re supposed to be ashamed. In general, writers are supposed to be ashamed of themselves. I can’t think of another medium or art form where the practitioner is supposed to pretend like they didn’t mean it. Like, “Oh, I just accidentally wrote this book. I had to write it, it was in my soul. It just poured out of me.” Can you imagine a director or a painter being like, “Oh, I hate painting actually, I’m so sorry. I pale in comparison to Helen Frankenthaler.”

PHILLIPS-HORST: Maybe athletes do that sometimes. Female athletes will be like, “Oh, I don’t know… I just do this really well because that’s how I learned it.”

OYLER: Not to bang on about David Foster Wallace over and over, but his great essay on Tracy Austin, the tennis player, and the Dumb Athlete Memoir is pretty useful here.

PHILLIPS-HORST: Okay, wait, I need to read that.

OYLER: It’s good. It’s really short too.

PHILLIPS-HORST: I’ve read all the Dumb Athlete Memoirs. The postgame interview is one of the most inane humiliations in American life.

OYLER: You should definitely read it. It’s called “How Tracy Austin Broke My Heart.”

PHILLIPS-HORST: I remember getting so much pushback from this piece I wrote about all these dumb self-help books. And one of them was Brené Brown, so I loved your essay that includes her, because she’s so fucking annoying, and she’s such a scam artist and an idiot, and her books are insufferable.

OYLER: What’s amazing to me about that is the trickle-down effect. I kept noticing people talk about vulnerability all the time. And then you go to the source and you’re like, “Oh, all of these New Yorker writers are basically citing this self-help scammer.” They’re writing these book reviews about Magic Mike’s like, “vulnerable working-class body.” You know what I mean?

PHILLIPS-HORST: The insistence on collapsing language at every turn. I love the line when you were like, “As the queer spaces like to say, radical softness is a boundless form in the distance.” I saw a sign at a coffee shop recently that was, “Tattoos as communal care.”

OYLER: Or it’s like, “Going to the rave and doing a bunch of drugs is actually a radical political act.” I think that’s just residue from our previous political era where everything had to be political or you had to do it in secret. It just seemed like we’re getting out of that.

PHILLIPS-HORST: I don’t know. I think the 2008 election was permanent.

OYLER: It’s a good argument. I think you should write that.

PHILLIPS-HORST: I just think that Hillary versus Obama calcified everyone into these camps where everything could be either new or old or right or wrong. It was also the beginning of obsessively turning politics into Marvel lore. There basically hasn’t been a week off since the Hillary-Obama fight.

OYLER: Yeah, but I do feel like the rapidly changing and deteriorating digital media ecosystem is producing something like a local media culture, which is not to say there are local papers, because there aren’t. I only noticed this because I’m doing publicity, and now so much of it, as opposed to when I published my novel three years ago, is newsletters. And there are lots of problems with that, but I certainly am less concerned with someone trying to ruin my life on Twitter if there’s a bunch of anonymous Reddit guys trying to attack me. Actually, a lot of anonymous guys from Reddit read that Washington Post review, based on the people who wrote about me on Twitter afterwards. It doesn’t really matter, but it doesn’t feel like your life is ruined anymore, which is nice.

PHILLIPS-HORST: I no longer have the fear. When I wrote this column regularly for Interview and The New Yorker , I was always brushing up against the radically online queer community and sometimes was on the verge of cancellation. It really did stress me out to just suddenly be getting a million quote tweets from people. But that era does seem to be over, and Twitter is basically dead.

OYLER: I always liked your writing, because you are unrepentant about making the kind of jokes that you’re going to make and you’re quite confident that it’s not harming anybody.

PHILLIPS-HORST: Thank you.

OYLER: In dark times, I was like, “At least they’re still doing Talk Hole .”

PHILLIPS-HORST: Hopefully we’re no longer the salve that society needs.

OYLER: No, I hope not.

PHILLIPS-HORST: This brings me to the question of plausible deniability. Is that a theme in your book at all? I certainly feel like it’s a theme in my writing, where I’m often carefully trying to make a joke that could appeal to a broader audience and could potentially be read by someone over here, but also by someone over there, as funny. It’s often on a woke-versus-anti-woke spectrum of someone being like, “Oh, you could be making fun of progressive politics, or you could be making fun of the limitations of language and how it prevents politics from being progressive.”

OYLER: Yeah, of course. That’s why the idea that we shouldn’t be using irony is ridiculous, because it allows you to express this ambiguity. Everyone wants there to be a judgment, everyone wants you to be like, “Is it bad or good? Are you pro or against?” And it’s very limiting if you’re any kind of writer, but particularly if you are a funny writer.

PHILLIPS-HORST: This came up when I was thinking about you in Berlin. When people ask you what you do, what do you say?

OYLER: I flip my hair and I say, “I’m the preeminent and most widely read critic of my generation.” And they’re like, “Really?” And I’m like, “Yeah, according to The Sunday Times UK .”

PHILLIPS-HORST: Would you say that to an Uber driver?

OYLER: No, I say I’m a writer. I mean, I can read the room. It depends on the context. If an Uber driver’s like, “What do you do?” I say, “Oh, I’m a writer.”

PHILLIPS-HORST: Then they say, “Oh, what do you write?” And you say?

OYLER: It depends. I say, “I wrote a novel,” and people know what that is. It’s just so much easier to say than, “I write cultural criticism.” What do you say?

PHILLIPS-HORST: Well, I really switch it up. I often will just say “copywriter” because I feel like that’s the most noble and normal job. And then they might be impressed if I’m like, “Oh, I do advertising for brands, I don’t know, Botox, Hilton.” They’re like, “Oh my goodness.” But it’s humiliating to say, “I’m a writer-comedian and I have a podcast.”

OYLER: They don’t care. But that’s why I have my little bit, you know what I mean? Also, I can do it because I’m a woman.

PHILLIPS-HORST: Well, I’m a gay guy, which is the same thing.

OYLER: You can also do it.

PHILLIPS-HORST: Do you use a thesaurus regularly?

OYLER: Regularly, when I’m writing, I’ll star a word when I want to use a different word and I’ll go back to it. And then sometimes I’m like, “I actually don’t need to find another word.” The best thesaurus is Roget’s International Thesaurus. And the concept of this thesaurus is wonderful. They have an online version that sucks, so you have to have the actual thesaurus. And it’s humongous. Basically, you look up a word, and it has a number, and then you go to the number and the words are grouped. The system is that the words are grouped by senses and meanings. So if you’re looking up a synonym for “windy,” you go there and you see all the synonyms for windy, and then it’s in the weather section, and then it’s in the atmosphere section. So you can do all sorts of fun stuff.

PHILLIPS-HORST: So it helps you go sideways a little bit?

OYLER: Yeah. Obviously, the classic writing class thing is don’t use the thesaurus too much, but—

PHILLIPS-HORST: Well, it’s obvious if it’s a pile of Disney adjectives.

OYLER: Yeah, I obviously don’t do that, but I think if I’m using a weird vocabulary, it comes naturally to me because I have a weird relationship to the English language because I’m from West Virginia and I didn’t read a real book until I was 18. Then I went to Yale and then I moved to Europe, where I was around all these people speaking either British English or English as a second language.

PHILLIPS-HORST: Do you think of certain words as being your words?

OYLER: You have a word of the moment, and then you’re like, “Oh, I’m saying that word all the time, I’ve got to stop using that.” Actually, when I was copying the book, I did keep a list to make sure there’s not too many instances of certain words in the book, “annoying” being one. Let’s see if I can find this.

PHILLIPS-HORST: I’ll wait.

OYLER: Okay, here’s the list: “actually, really, desperate, vaguely, fairly, pretty, pretty much, more or less, in part, relatively, proliferation, or proliferate, broadly, interesting, tedious, general, generally, elusive, demonstrate, elaborate, regardless, nevertheless, horrible, terrible, indeed, necessarily, elaborate, not elaborate, but elaborate, volatile, ostensibly, weird, stupid, perhaps, it’s tempting, in fact, doesn’t matter, vast majority, under threat, perceive, toward or towards, afterwards, afterward, onwards, initiate, unique, still, simply, straightforward, transform, fervour/fervor, operate, situation, incredibly, sense, shocking, righteous, ameliorate, of course, this is why, mostly, deal with, suggests, torturous, deep down, concomitant, same, agitate, suffering, and ruthless.”

PHILLIPS-HORST: Honestly, you did a great job not overusing those words.

OYLER: Thanks.

PHILLIPS-HORST: They’re words that people use a lot, and often all in the same way, way too much.

OYLER: Yeah, exactly.

PHILLIPS-HORST: I love this part where you’re talking about the Ben Lerner novel [ Leaving the Atocha Station ] and there’s the American guy who’s involved with the Spaniard and, because of the language barrier, they end up projecting all this meaning onto each other.There’s something so beautiful, and I think it especially happens with a lover who doesn’t speak your language, or where you’re fumbling in a foreign country, where you end up in a world of understanding that’s post-language. You create some sort of extra-linguistic experience that’s out here in the ether.

OYLER: Yeah, you have to come up with different ways to communicate. Part of the question is, “Can I be in love with Berlin if I am not fluent in German?” And I obviously feel very strongly about Berlin. I love living in Berlin, even though it has this tedious—if I may use one of my words—reputation for expats not authentically engaging with it or whatever. But my argument is that it is authentically what Berlin is and always has been, which is not German. I don’t want to live in Germany, I want to live in Berlin. It’s not diverse like New York, but Berlin is a very cosmopolitan city. I’m friends with lots of Americans and British people and Australians, but also friends with Italians, friends with people from all over who are operating in English. I would say the great love that is represented for me in this book is Berlin in English. It’s a great joy to be able to hear your language used by non-native speakers, but in an incredibly fluent, competent way, because they use the language in ways that you could just never dream of.

PHILLIPS-HORST: It’s very endearing. It helps you see the world through the eyes of a child again, and you realize how beautiful words can be. I think about this all the time with French songwriters. Songwriting can be so embarrassing and so literal, and they find a way to make something just a little bit to the side of literal.

OYLER: Yeah. Or remember that Eurotrash TikTok thing that was really popular like, last summer or whatever? And that joke, those lyrics—that’s also sublime.

PHILLIPS-HORST: Okay, this isn’t even really a question, but I will say that as I was reading the autofiction essay, I was disagreeing with you for a lot of it. I was like, “No, autofiction is the coward’s way out. You’re not brave enough to write non-fiction and be fact-checked and stand by your own opinions and put your own beliefs out there and expose your true thoughts to the world, but you’re also not imaginative enough to write actual fiction. So you’re just going to take these ideas and pass them off as fiction and absolve yourself of responsibility.” And then at the end, you so cleverly, slyly… I mean, revealing the title of an essay later on in the essay is always a great trick to give people this aha-moment… but I was just like, “Oh my God, she’s right.”

OYLER: Thank you. I think autofiction gets this bad rap that you’re talking about because the lives that the writers are reflecting are often not that interesting. I mean, some of the books are great. I love the Spindler books, I love Sheila Heti’s books as well. And the bad rap comes from people saying that Sheila Heti is self-obsessed, and all these lesser autofiction figures, their lives aren’t very exciting. But let’s say I have a very exciting life and I need to write about something that happened to me, but it involves some other people.

PHILLIPS-HORST: You need to write about something that happened to you.

OYLER: But I am very afraid of getting sued. We were talking about fact-checking earlier. When I do my journalism for Harper’s , I am incredibly facetious about getting notes and fact-checking. And they contacted those two boyfriends to fact-check with them. But let’s say I’m writing a social novel about a certain scene involving lots of inspiration from real people. You don’t live in a vacuum. It’s not just your life, there are other people involved, and they might disagree with you and they might not cooperate, or they might even sue you. For all of these reasons, I think it’s good to do autofiction. But from a more artistic perspective, you don’t. 

PHILLIPS-HORST: Not just a cover-your-own-ass perspective…

OYLER: It’s not just a cover-your-own-ass perspective, but you want to be able to be a little flexible. I like writing that kind of weird reportage stuff. But if you want to get into other people’s motivations, which I do, it’s quite hard to project onto people in non-fiction while still being ethical, whereas that’s the whole job of a novelist. I’m sorry, I’m getting all riled up about autofiction.

PHILLIPS-HORST: Well, maybe that’s the next book. Vacation’s over.

OYLER: Yeah. I have two weeks, then I’ll buy my Helen Frankenthaler.

PHILLIPS-HORST: Well, I guess we have to go. This was an absolute joy.

OYLER: This was great.

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5 Book Reviews to Read This Weeks

“the collection reads like a juvenile burn book, totally uninterested in the world outside her group chat.”.

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Our fist of furious reviews this week includes Ann Manov on Lauren Oyler’s No Judgement , Hilton Als on Cynthia Carr’s Candy Darling , Gene Seymour on Hanif Abdurraquib’s There’s Always This Year , David Klion on Alexander Ward’s The Internationalists , and Laura Miller on Lionel Shriver’s Mania .

Brought to you by Book Marks , Lit Hub’s home for book reviews.

“‘Literary critics do fulfill a very important role, but there seems to be a problem with much contemporary criticism,’ Simon Leys once wrote. ‘One has the feeling that these critics do not really like literature—they do not enjoy reading.’ This was a line my mind kept drifting to as I plodded through Lauren Oyler’s debut essay collection, No Judgment . The book was originally to be called Who Cares , and perhaps that title should have been retained. Who cares, really, about any of this? … No Judgment is already dated, even before its release …

It’s not that all of Oyler’s subjects are uninteresting..But Oyler is contemptuous of disagreement, quickly bores of research, and rigidly attempts to control the reader’s responses. As a result, the writing is cramped, brittle. Oyler clearly wishes to be a person who says brilliant things—the Renata Adler of looking at your phone a lot—but she lacks the curiosity that would permit her to do so … It turns out that No Judgment displays many of the flaws Oyler once so forcefully identified in others … Oyler doesn’t want to be a writer of personal essays; she wants to be an erudite critic of the old school. But again and again, she drifts toward personal recriminations and eschews any sustained discussion of literature …

Oyler claims she is well read, even a ‘snob,’ but great swaths of No Judgment rely on the thinnest of online research … Oyler conceives of her own claim to cultural elitism as a series of adolescent signifiers flung on with the pride of a Goth teenager donning her first Hot Topic belt … her writing indeed seems aimed at little more than scoring points against her rivals, real or imagined. The resulting collection reads like a juvenile burn book, totally uninterested in the world outside her group chat … The pieces in No Judgment are airless, involuted exercises in typing by a person who’s spent too much time thinking about petty infighting and too little time thinking about anything else.”

–Ann Manov on Lauren Oyler’s No Judgement ( Bookforum )

“Like Marilyn Monroe—another brilliantly constructed persona—Darling was a master at projecting energy in a two-dimensional medium, by which I don’t mean that Candy, who grew up in Massapequa Park, on Long Island, radiated physical joy, like Marilyn cavorting in the California surf. If anything, her energy was of a blondness turned inside out: no matter how much she smiled or gave come-hither looks, she was a melancholy urban creature, protected by a sense of irony that sometimes lit her from within or lit up the crummy hotel rooms and park benches where she posed … the point of Darling’s life—a point she insisted on with the few people she was close to—was that you can’t walk away from yourself, no matter how difficult it is to be who you are. ‘Always be yourself,’ Candy told a cousin, and it’s the story of how she became a self—or, more accurately, lived simultaneously in her real and her fantasy selves—that Carr tells in her book. Candy Darling is the first full-length biography of the trans star, and I can’t imagine a better or more honest writer for the task …

By honoring Darling’s disconnection from her birth name (what some trans people call their ‘dead name’), Carr not only meets Darling on her own terms but insists that we do, too. ‘The word ‘trans’ implies a journey,’ Carr writes, and the journey was a long and arduous one, driven and framed by romanticism and conviction.”

–Hilton Als on Cynthia Carr’s Candy Darling: Dreamer, Icon, Superstar ( The New Yorker )

“This disclosure, one in a torrent of observations, ruminations, and reveries tightly woven into the book’s narrative, gives you some idea of Abdurraqib’s willingness to pile everything he’s able into his quasi-autobiographical, proto-philosophical inquiry into turn-of-the-twenty-first-century basketball, especially its prodigiously gifted Ohio-bred avatar for both triumph and tribulation, LeBron James.  In this testament to both a sport and a state, Abdurraqib leads with his own heart, one that’s been broken over time by loss of family, friends, even a home … an awesomely discursive mixtape of memoir, film criticism, tone poem, and sports punditry … It is more a portrait of Abdurraqib-the-artist as a young man, living his own tribulation-laden life through the last decade of the twentieth century and the first two of the twenty-first while taking in everything going on around him …

Paraphrasing that talented teenage goalkeeper Albert Camus , the intellect, if it’s worth anything in its own fields of play, watches itself as intently and as unsparingly as it watches others. Maybe that’s why Abdurraqib’s book makes its most breathtaking pivots when he probes the act of bearing witness … Maybe, a reader might wonder, it’s just gravity—a law guaranteeing that every ascension that comes with the fulfillment of a wish is followed by a fall to Earth, whether soft like a feather or hard like a building. Abdurraqib’s chronicle doesn’t directly say this. But as the seconds tick away in the fourth quarter of his riveting game, he accepts the pattern, the persistence of dreams continuing into their own ongoing cycle, the way Brian Wilson says he wanted to fade ‘God Only Knows’ with a loop of the chorus, ‘a sort of infinity spiral.’ And if you’re inclined to wonder, even at this late point in the action, why Abdurraqib thinks Brian Wilson has anything to do with basketball or everything else he’s been dealing with, then maybe you need to turn the play clock back to the first quarter and, this time, be prepared for the break.”

–Gene Seymour on Hanif Abdurraquib’s There’s Always This Year ( Bookforum )

The Internationalists

“Anyone who writes about current events knows how cruel the gap between final edits and publication can be … the book’s resilient-comeback narrative has already been undermined by global events. This is in no sense Ward’s fault—unlike Sullivan, he bears no responsibility for the state of US policy in the Middle East or anywhere else—but it does cast the principal subjects of his book in a different light than he presumably wanted or expected. Written with what was clearly extensive access, The Internationalists reflects the weaknesses as well as the strengths of Biden’s foreign policy advisers. Team Biden members sees themselves as a group of sober-minded yet idealistic professionals who took office intending to end wars and to repair America’s ailing body politic at home and its damaged reputation abroad in the wake of Donald Trump.

Nevertheless, on their watch the United States has been drawn into a set of major new wars whose unintended consequences threaten to prematurely end the Biden presidency and transfer the reins of global power back to Trump. Like Ward, they had set out to tell an uplifting story about American global leadership, but at some point they lost the plot … The idea of ‘getting a win’ for the Biden administration is representative of a larger problem with how the A-Team views US foreign policy. Their decisions have real and often bloody consequences on the ground, but wins and losses are tallied in terms of the political consequences for Biden and the professional standing of his advisers. What these wins and losses might mean for the rest of the world is rarely remarked upon.”

–David Klion on Alexander Ward’s The Internationalists: The Fight to Restore American Foreign Policy After Trump ( The Nation )

“The intimacy of domestic politics moderates Shriver’s polemical side, which, when given free rein—as during an infamous 2016 speech she gave on cultural appropriation while wearing a sombrero—usually turns out to be smug, crude and obtuse. In Shriver’s tiresome new novel, Mania ,  the balance is off … As parody goes, this is ham-fisted stuff. Ironically, Mania lacks the discernment required to make it work. Satire demands precision, and Shriver applies an ax to a job calling for a scalpel. Although Shriver has made writing unlikable protagonists into a sort of cottage industry, Pearson is something more, a preeningly self-righteous didact swathed in false modesty about her own supposedly mediocre brain. Like many of Shriver’s narrators, Pearson often speaks or narrates with the sort of affected, antiquated vocabulary of a stock character from a 1930s movie, the portly gentleman in a white three-piece suit, up to no good and puffing on a cigar, played by Sidney Greenstreet …

The most—really the only—intriguing aspect of the novel is the relationship between these two friends and Pearson’s growing realization that Emory lacks a moral center. Emory herself remains a cipher. Is she a sociopath? Or just an opportunist? If only she  were the unlikable narrator to tell this story. That would constitute a stretch for Shriver, imagining the interiority of a character who’s not basically an avatar of herself. That would be a truly daring choice, and dare I say it, a smart one.”

–Laura Miller on Lionel Shriver’s Mania ( The New York Times Book Review )

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    This pioneering book has provided countless graduate students and researchers with a road map to success. Its model takes you through the logical progression needed for producing a quality literature review—while taking the mystery out of the process. Available Formats. ISBN: 9781071852903.

  6. A Complete Guide on How to Write Good a Literature Review

    "A literature review surveys books, scholarly articles, and any other sources relevant to a particular issue, area of research, or theory, and by so doing, provides a description, summary, and critical evaluation of these works in relation to the research problem being investigated.

  7. The Literature Review

    Reviews. Preview. This second edition of Diana Ridley's bestselling book provides a step-by-step guide to conducting a literature search and literature review, using cases and examples throughout to demonstrate best practice. Ridley outlines practical strategies for conducting a systematic search of the available literature, reading and note ...

  8. What is a literature review?

    A literature or narrative review is a comprehensive review and analysis of the published literature on a specific topic or research question. The literature that is reviewed contains: books, articles, academic articles, conference proceedings, association papers, and dissertations. It contains the most pertinent studies and points to important ...

  9. Literature Review: The What, Why and How-to Guide

    What kinds of literature reviews are written? Narrative review: The purpose of this type of review is to describe the current state of the research on a specific topic/research and to offer a critical analysis of the literature reviewed. Studies are grouped by research/theoretical categories, and themes and trends, strengths and weakness, and gaps are identified.

  10. How to write a superb literature review

    The best proposals are timely and clearly explain why readers should pay attention to the proposed topic. It is not enough for a review to be a summary of the latest growth in the literature: the ...

  11. Writing a literature review

    Writing a literature review requires a range of skills to gather, sort, evaluate and summarise peer-reviewed published data into a relevant and informative unbiased narrative. Digital access to research papers, academic texts, review articles, reference databases and public data sets are all sources of information that are available to enrich ...

  12. Steps in Conducting a Literature Review

    A literature review is an integrated analysis-- not just a summary-- of scholarly writings and other relevant evidence related directly to your research question.That is, it represents a synthesis of the evidence that provides background information on your topic and shows a association between the evidence and your research question.

  13. What is a Literature Review?

    A literature review is a survey of scholarly sources on a specific topic. It provides an overview of current knowledge, allowing you to identify relevant theories, methods, and gaps in the existing research. There are five key steps to writing a literature review: Search for relevant literature. Evaluate sources. Identify themes, debates and gaps.

  14. Research Guides: Literature Reviews: Further Resources

    The Literature Review: A Step-by-Step Guide for Students (2012) by Diana Ridley. Doing a Literature Review: Releasing the Research Imagination (2018) by Chris Hart. The Literature Review: Six Steps to Success (2012) by Lawrence A. Machi and Brenda T. McEvoy. Conducting research literature reviews : from the internet to paper (2020) by Arlene Fink.

  15. PDF LITERATURE REVIEWS

    2. MOTIVATE YOUR RESEARCH in addition to providing useful information about your topic, your literature review must tell a story about how your project relates to existing literature. popular literature review narratives include: ¡ plugging a gap / filling a hole within an incomplete literature ¡ building a bridge between two "siloed" literatures, putting literatures "in conversation"

  16. What is a Literature Review?

    A literature review is a review and synthesis of existing research on a topic or research question. A literature review is meant to analyze the scholarly literature, make connections across writings and identify strengths, weaknesses, trends, and missing conversations. A literature review should address different aspects of a topic as it ...

  17. Books and Websites

    Call Number: Q180.55.M4 F56 2010. ISBN: 1412971896. Publication Date: 2009-03-26. The Third Edition of Conducting Literature Reviews: From the Internet to Paper provides readers with an accessible but in-depth look at how to synthesize research literature. Bestselling author Arlene Fink shows researchers how to justify the need for and ...

  18. Writing a Literature Review

    A literature review is a document or section of a document that collects key sources on a topic and discusses those sources in conversation with each other (also called synthesis ). The lit review is an important genre in many disciplines, not just literature (i.e., the study of works of literature such as novels and plays).

  19. Chapter 9 Methods for Literature Reviews

    Literature reviews play a critical role in scholarship because science remains, first and foremost, a cumulative endeavour (vom Brocke et al., 2009). As in any academic discipline, rigorous knowledge syntheses are becoming indispensable in keeping up with an exponentially growing eHealth literature, assisting practitioners, academics, and graduate students in finding, evaluating, and ...

  20. Books On Literature Reviews

    This guide aims to assist you with the process of writing a literature review.

  21. Ten Simple Rules for Writing a Literature Review

    Literature reviews are in great demand in most scientific fields. Their need stems from the ever-increasing output of scientific publications .For example, compared to 1991, in 2008 three, eight, and forty times more papers were indexed in Web of Science on malaria, obesity, and biodiversity, respectively .Given such mountains of papers, scientists cannot be expected to examine in detail every ...

  22. 5. The Literature Review

    A literature review may consist of simply a summary of key sources, but in the social sciences, a literature review usually has an organizational pattern and combines both summary and synthesis, often within specific conceptual categories.A summary is a recap of the important information of the source, but a synthesis is a re-organization, or a reshuffling, of that information in a way that ...

  23. What is a Literature Review? How to Write It (with Examples)

    A literature review is a critical analysis and synthesis of existing research on a particular topic. It provides an overview of the current state of knowledge, identifies gaps, and highlights key findings in the literature. 1 The purpose of a literature review is to situate your own research within the context of existing scholarship ...

  24. Book or Literature Reviews

    A literature review is a "comprehensive study and interpretation of literature that addresses a specific topic" (Aveyard, 2010).. Literature reviews are generally conducted in one of two ways: 1) As a preliminary review before a larger study in order to critically evaluate the current literature and justify why further study and research is required.. In this case, the researcher must ...

  25. Literary Hub

    Emily Nemens On the All-But-Invisible Role of Interpreters, in Literature and in Baseball. April 8, 2024. Read Full Story. Death and The Maiden: What Rewatching The OC Can Teach Us Now Kelly Marie Coyne on Society's Lethal Obsession With the White Starlet. ... 5 Book Review to Read This Weeks

  26. Lauren Oyler Wishes You'd Fact-Check Your Reviews

    Fact-Check Your Reviews. By Steven Phillips-Horst. April 9, 2024. Lauren Oyler, photographed by Carleen Coulter. I first discovered Lauren Oyler, as many did, when I read her scathing review of Jia Tolentino's essay collection Trick Mirror in LRB. Tolentino was a writer I felt got too much credit for making facile observations, and I ...

  27. 5 Book Reviews to Read This Weeks ‹ Literary Hub

    By Book Marks. April 11, 2024. Our fist of furious reviews this week includes Ann Manov on Lauren Oyler's No Judgement, Hilton Als on Cynthia Carr's Candy Darling, Gene Seymour on Hanif Abdurraquib's There's Always This Year, David Klion on Alexander Ward's The Internationalists, and Laura Miller on Lionel Shriver's Mania. Brought ...

  28. Behavioral Sciences

    A systematic review was conducted of the literature published between 2010 and 2023 in the PsycINFO, ERIC, Education, and Psychology databases. An initial 1176 studies were reviewed by abstract, of which 485 were read in full text, leading to the selection and analysis of 22 studies.