How to Write an Annotated Bibliography

An annotated bibliography is more than just a list of sources. It's a critical tool that demonstrates your research skills, shows you've engaged deeply with the literature, and helps you organise your thinking before writing a paper.

What Is an Annotated Bibliography?

An annotated bibliography is an organised list of sources (books, articles, websites, etc.), each followed by a brief paragraph — the "annotation" — that summarises, evaluates, and/or reflects on the source. It combines a properly formatted citation with a 100–200 word annotation.

Types of Annotations

• Descriptive/Summary — Summarises the main arguments, methods, and conclusions without evaluation
• Evaluative/Critical — Assesses the source's reliability, relevance, and quality in addition to summarising
• Reflective — Explains how the source relates to your own research and how you plan to use it

Most university assignments require evaluative or reflective annotations. Always check your assignment brief.

Step-by-Step: Writing an Annotation

Step 1: Cite the Source

Format the citation according to the required style (APA, MLA, Chicago, Harvard). This goes first, before your annotation paragraph.

Step 2: Summarise

In 2–3 sentences, describe the main argument, methodology, and key findings of the source. What is the author trying to say?

Step 3: Evaluate

Assess the source critically:

• Is the methodology sound?
• Is the author credible and qualified?
• Is the information current and relevant?
• Are there any biases or limitations?

Step 4: Reflect

Explain how this source fits into your research. Will it provide background? Support your argument? Offer a counterpoint?

"A good annotation doesn't just describe what a source says — it explains why it matters for your research."

Example: APA Format

Johnson, S. (2024). The impact of social media on student mental health. Journal of Educational Psychology, 48(3), 234–251. https://doi.org/10.xxx

Johnson examines the relationship between social media usage and anxiety among university students, using a mixed-methods approach with 500 participants across five UK universities. The study finds a significant correlation between daily social media usage exceeding three hours and increased anxiety levels. While the large sample size strengthens the findings, the cross-sectional design limits causal conclusions. This source will be central to my literature review, providing quantitative evidence to support my argument that social media policies should be considered in student wellbeing strategies.

Common Mistakes

• Writing a simple summary without evaluation — add critical analysis
• Copying the abstract — write in your own words
• Inconsistent citation formatting — stick to one style throughout
• Annotations that are too long or too short — aim for 100–200 words
• Not explaining relevance to your own research

Wrapping Up

An annotated bibliography is a valuable exercise in academic research. It forces you to engage critically with each source and builds a strong foundation for your paper. Take time to write thoughtful annotations, and the rest of your writing will flow more easily.