How to Write an Annotated Bibliography (With Examples)

The Two Parts of Every Entry

Every entry in an annotated bibliography has the same two elements, in the same order. First the citation, then the annotation directly beneath it, indented.

1. The citation. The full reference entry, formatted in whichever style your brief specifies (APA, MLA, Harvard, Chicago). Same rules as a normal reference list, no shortcuts because the annotation follows.
2. The annotation. One paragraph, usually 100 to 200 words, that summarises the source, assesses it, and says how it fits your project. Some briefs want only a summary. Most want the assessment too.

Entries are ordered alphabetically by the first element of the citation, exactly like a reference list. That is the single most common thing students forget, so I am putting it first: the citation still obeys every rule it would obey anywhere else. If you are shaky on those rules, our guides to APA format and Harvard referencing cover the entry structure element by element.

What Goes in the Annotation

An annotation is not a book review and it is not a full abstract copied across. It is a tight paragraph that does three jobs, and the standard advice is to hit them in this order: summarise, assess, reflect.

• Summarise. What is the source about? What is the main argument or finding, and what did the authors actually do? One or two sentences.
• Assess. Is it credible, current, and relevant? How does it compare to the other sources on your list? Note the method, the sample, or the scope where those matter.
• Reflect. How does this source fit your project? Does it frame your background, supply a method you will borrow, or offer a finding you will argue against?

Which of the three you emphasise depends on the type of annotated bibliography you were asked for, and there are two.

Descriptive vs Evaluative (Check Your Brief First)

A descriptive (or informative) annotation summarises the source and stops there. It tells a reader what is inside without passing judgement. A critical (or evaluative, or analytical) annotation does the summary and then weighs the source: strengths, weaknesses, and its use to you.

Most university briefs, and every one I have seen attached to a dissertation, want the critical version. Read your brief before you write a single entry. Writing twenty descriptive annotations when the marker wanted evaluation is a rewrite you can avoid by reading one sentence carefully. Yes, the wording of the brief matters that much.

A Worked Example in APA

Here is one complete entry, critical style, in APA 7. The citation uses a hanging indent in your document; the annotation sits underneath. I have used a plausible illustrative source so you can see the shape.

Notice the moves in order: two sentences of summary, two of assessment (recent, large, but single-site and self-reported), then one of reflection that connects it to another source and to the writer’s own argument. That final connecting sentence is what lifts an annotation from a summary into something a literature review can grow from.

Weak vs Strong: The Same Source, Two Annotations

The format is easy to get right and easy to get thin. Here is the same source annotated badly and then well, so you can see the difference at a glance.

The weak version tells a marker nothing they could not get from the title. It has no specifics (how many participants, what method), no judgement (what is strong or shaky about it), and the phrase “useful for my essay” does no work. The strong version names the finding, weighs the evidence, and positions the source against another. Same length target, completely different value.

The Same Entry in MLA

Only the citation format changes; the annotation reads the same. In MLA 9 the entry above becomes:

Full first names instead of initials, quotation marks around the article title, “vol.” and “no.” and “pp.” spelled out, the year moved after the issue. Small differences, and markers notice every one of them. If you are switching between styles, our comparison of six citation styles lays the formats side by side.

A Five-Step Process

Once the format is clear, the work is repetitive in the best way. Run every source through the same five steps.

1. Gather and vet your sources. Collect more than you need, then keep the credible and relevant ones. Our guide to finding academic sources covers where to look and how to judge quality.
2. Write the citation first. Format the full reference entry before you write a word of annotation. It forces you to record the details while the source is open.
3. Read with a pen. Note the main argument, the method, and one strength and one limitation as you read. Those notes are your annotation in rough form.
4. Draft the annotation. Summarise, assess, reflect, in that order, in your own words. Keep it to the word count in the brief.
5. Alphabetise and proof. Sort by the first element of each citation, then check every entry against the style rules once more.

Common Mistakes (The Ones That Cost Marks)

• Pasting the abstract. The abstract is the authors’ words and their framing. An annotation must be yours, and it must assess, which an abstract never does.
• Summarising with no assessment. If the brief asked for a critical annotation, a pure summary is half an answer. Always say what the source is worth to you.
• Sloppy citation format. A strong annotation attached to a broken citation still loses the citation marks. The reference rules do not relax here.
• Wrong order. Entries go alphabetically, not in the order you read them or by date, unless your brief specifically says otherwise.
• Copying phrasing from the source. An annotation is written in your own words. If you lean on the source’s sentences, you are paraphrasing, and our guide to paraphrasing without plagiarising explains where the line sits.

Why This Assignment Is Worth Doing Properly

An annotated bibliography is often set as a stepping stone. The reflection sentences you write, the ones that connect one source to another and to your argument, are the raw material of a literature review. A review is not a list of annotations laid end to end, though. It groups sources by theme and puts them in conversation, which is a skill of its own that our guide to synthesising sources walks through. Do the annotations well now and that later step gets much easier.