How to Write an Annotated Bibliography: Format and Examples

An annotated bibliography is a research and writing tool that demonstrates your engagement with sources. Unlike a standard bibliography that simply lists references, an annotated bibliography requires you to summarise, evaluate, and reflect on each source. It is a common assignment in its own right, and a useful tool for managing sources before writing a dissertation or extended research paper.

What an annotation contains

A good annotation does three things:

1. Summarises — What does the source argue or find? What is the main claim or contribution?
2. Evaluates — How credible, rigorous, and reliable is the source? What are its strengths and limitations?
3. Reflects — How is this source relevant to your research question? How does it fit with other sources you have read?

Not all annotations need all three elements in equal measure. A brief annotation might only summarise and note relevance; a fuller annotation will include evaluation of methodology or perspective.

Format

An annotated bibliography entry has two parts: the full reference citation, followed immediately by the annotation paragraph (indented to match the citation style's hanging indent convention).

APA 7th edition format

Roediger, H. L., & Karpicke, J. D. (2006). Test-enhanced learning: 
    Taking memory tests improves long-term retention. Psychological 
    Science, 17(3), 249–255. https://doi.org/10.1111/j.1467-9280.2006

    This landmark experimental study demonstrated that taking a 
    memory test after studying produced significantly better long-term 
    retention than re-reading the same material. Using prose passages 
    with college students, Roediger and Karpicke found that students 
    who were tested recalled 50% more one week later than those who 
    re-studied. The study has been highly influential in educational 
    psychology and is the primary empirical foundation for practice 
    testing interventions. A limitation is that the stimulus materials 
    were relatively simple prose passages rather than the complex, 
    multi-concept content typical of real educational settings. This 
    source directly supports my argument that retrieval practice is 
    superior to passive review strategies for students revising for 
    high-stakes assessments.

Harvard format

Roediger, H. L. and Karpicke, J. D. (2006) 'Test-enhanced learning: 
    Taking memory tests improves long-term retention', Psychological 
    Science, 17(3), pp. 249–255.

    This experimental study provides strong evidence that retrieval 
    practice — being tested on material — produces substantially 
    better long-term retention than re-reading. [Continue as above]

Writing each element

The summary (2–4 sentences)

State:

• The type of source (experimental study, theoretical framework, policy report, etc.)
• The main argument or findings
• The discipline or context

Weak summary: "This article discusses memory and learning."
Strong summary: "This experimental study compared retrieval practice with re-reading in a college population and found that students who completed a practice test after studying recalled significantly more material at a one-week delay than those who re-read the passage."

The evaluation (2–4 sentences)

Consider:

• Methodology: how was the research conducted? What are the strengths/limits of the method?
• Sample: who were the participants? Is the sample representative?
• Publication: is it peer-reviewed? Is the journal reputable? Is it recent enough?
• Perspective: does the author have a particular theoretical or ideological standpoint?

Example evaluation:

"The study was published in a leading peer-reviewed psychology journal and has been highly cited, suggesting strong academic credibility. However, the participant sample consisted entirely of college students studying prose passages under controlled conditions, which limits the generalisability of the findings to real educational settings with more complex, subject-specific content."

The reflection (1–3 sentences)

Explain how the source relates to your research question or argument:

"This source is directly relevant to my dissertation on revision strategies, as it provides the foundational empirical evidence for practice testing. It will be used to establish the evidence base in my literature review, alongside Dunlosky et al.'s (2013) meta-analysis."

Full worked example (150 words)

Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & 
    Willingham, D. T. (2013). Improving students' learning with 
    effective learning techniques. Psychological Science in the Public 
    Interest, 14(1), 4–58.

    This comprehensive review evaluated ten commonly used learning 
    techniques across multiple dimensions including learning conditions, 
    student populations, and educational levels. Practice testing and 
    distributed (spaced) practice were rated as having the highest 
    utility, while highlighting, re-reading, and summarisation were 
    rated as having low utility due to limited empirical support. The 
    review is unusually authoritative in scope — covering multiple 
    disciplines and age groups — though its focus on empirical learning 
    science means it does not address broader pedagogical or 
    motivational factors. This source is essential to my argument that 
    student revision strategies are systematically misaligned with the 
    evidence on effective learning.

Organising the annotated bibliography

Alphabetical — Most assignments require alphabetical order by author's last name, the same as a standard bibliography.

Thematic — Some assignments organise sources into sections by topic or theme. If so, annotate how each source fits the theme it appears under.

Chronological — Less common; used when tracing the development of a field over time.

Common mistakes

Summary only — Annotations that only describe what a source says miss the evaluation and reflection that distinguish an annotated bibliography from a regular bibliography.

Too brief — A 30-word annotation does not demonstrate serious engagement. Aim for 100–200 words.

Not evaluating critically — Every source has limitations. A good annotation identifies at least one methodological or contextual limitation, even for strong sources.

Mismatch between citation and annotation — The annotation should clearly correspond to the cited source, not a different work or a general area of the field.

For citation formatting help, use the Citation Reference Formatter. For building a full literature review from your annotated bibliography, see How to Write a Literature Review.