How to write a literature review

If you're writing a thesis, research paper, or extended essay, you'll almost certainly need to write a literature review. For many students, it's one of the most daunting parts of the process – and one of the most misunderstood. In this guide, we'll walk you through exactly what a literature review is, why it matters, and how to write one step by step.

What is a literature review?

A literature review is a critical summary and analysis of existing research and scholarly writing on a specific topic. It's not just a list of summaries – it's a structured argument that shows how existing knowledge informs your own research. A good literature review identifies key themes, debates, and gaps in the existing research, and explains how your work fits into or advances that conversation.

Why do you need a literature review?

A literature review shows that you understand the field you're working in. It demonstrates that you know what has already been researched, that you can critically evaluate sources, and that your own work is grounded in existing knowledge. It also helps you avoid inadvertently repeating work that's already been done, and often points you toward the specific angle or research gap you should focus on.

How to find relevant sources

Start by searching academic databases such as Google Scholar, JSTOR, PubMed, or your university's library portal. Use specific keywords and Boolean operators (AND, OR, NOT) to narrow your results. Prioritise peer-reviewed journal articles, books from academic publishers, and relevant reports or theses. Check the reference lists of the best sources you find – this "snowball" method is one of the most efficient ways to discover relevant literature. Keep track of everything you find with a reference manager like Zotero or Mendeley.

How to structure a literature review

A literature review should have a clear introduction, a structured body, and a conclusion. In the introduction, explain the scope and purpose of your review. In the body, organise your discussion thematically – by topic, debate, or methodological approach – rather than summarising one source at a time. Group sources that address similar points and compare their findings. In the conclusion, summarise the key themes and highlight the gap or question that your own research will address.

How to analyse and synthesise sources

The most important skill in a literature review is synthesis – bringing multiple sources together to build a larger argument, rather than simply describing what each one says. Use phrases like "while Jones (2020) argues that..., Smith (2022) challenges this by..." to show how sources relate to each other. Always evaluate critically: consider the methodology, context, and limitations of each study. This shows intellectual depth and positions your own work confidently.

Common mistakes to avoid

Several pitfalls trip up students writing their first literature review. Avoid writing it as a series of source summaries – this is not a literature review, it's an annotated bibliography. Don't include sources just to have a long list – every source should serve a clear purpose in your argument. Avoid relying too heavily on secondary sources. And always use consistent citations – Memmo's e-reader generates ready-made references in APA, Harvard, Oxford, Vancouver, and IEEE formats directly from your e-books. 📚✍️

Good luck with your studies!