To write an annotated bibliography, you list each source as a full citation and follow it with a short paragraph that summarizes, evaluates and explains how the source fits your research. The annotation is where the marks are.
Tutors set annotated bibliographies to check that you are reading closely and judging sources, not just collecting titles. This guide shows the types of annotation, a simple method for writing them and correctly formatted examples.
What Every Annotation Should Answer
- What is the source about?
- How did the author approach it?
- What did they find or conclude?
- How reliable and useful is it?
- How does it fit your research question?
If your brief gives no detail, answer all five in 100 to 200 words per source. That covers summary, evaluation and relevance in one paragraph.
What an Annotated Bibliography Is
Each entry has two parts. First comes the citation, formatted exactly as it would be in your reference list. Underneath sits the annotation, a paragraph about the source.
Entries are usually arranged alphabetically by the first author's surname. Some tutors ask you to group them by theme or sub-question instead, which can make your research map clearer.
An annotated bibliography may stand alone as an assignment, or it may be an early stage of a larger project such as a research paper, dissertation or capstone.
Three Kinds of Annotation
| Type | What it does | When tutors ask for it |
|---|---|---|
| Descriptive | Describes the scope and content of the source without judging it | Early research and introductory modules |
| Summary | Summarizes the argument, methods and findings | When the tutor wants evidence of close reading |
| Evaluative | Summarizes, then assesses strengths, limits and usefulness | Most university assignments |
Most briefs at university level expect an evaluative annotation that also explains relevance to your topic. When in doubt, write that combined version; it is very rarely marked down.
A Step-by-Step Method
- Pin down your research question. Every source must earn its place by speaking to it.
- Search and screen. Use library databases, filter for peer review and date, and drop weak fits from the abstract.
- Read actively. Note the argument, method, findings and limitations in your own words as you go.
- Write the citation first. Getting it right now avoids a frantic formatting session at the end.
- Draft the annotation using the five questions above.
- Trim. Cut openings such as "In this article, the author discusses" and go straight to the point.
- Format the whole list in one pass, checking order, indents and spacing.
How to Evaluate a Source
Evaluation is where most students are least sure what to say. A useful set of angles, taught by many university libraries, is the CRAAP test.
| Criterion | Question to ask | Sample annotation phrase |
|---|---|---|
| Currency | Is it recent enough for this topic? | "Although published in 2014, it remains a widely cited baseline..." |
| Relevance | Does it address my question directly? | "Focuses on adolescents, the population of my study..." |
| Authority | Who wrote and published it? | "Peer-reviewed and written by public health researchers..." |
| Accuracy | Is it supported by evidence? | "Findings rest on a large, representative sample..." |
| Purpose | Why was it written, and is there bias? | "Funded by an industry body, so its conclusions need care..." |
You do not need every criterion in every annotation. Choose the two or three that matter most for that source.
APA 7th and MLA 9th Examples
In APA 7th, the citation follows reference-list format with a 0.5-inch hanging indent. The annotation starts on a new line and is indented 0.5 inches from the left margin as a block. The whole page is double-spaced, with "Annotated Bibliography" centered in bold at the top.
Okoro, T., & Lindqvist, A. (2022). Hybrid working and employee wellbeing: A two-year panel study. Journal of Workplace Health, 18(2), 101–117. https://doi.org/10.0000/example
Okoro and Lindqvist surveyed office staff every quarter for two years to compare wellbeing across remote, hybrid and on-site arrangements. Hybrid workers reported the highest wellbeing, while fully remote workers reported lower stress but more loneliness. The long timeframe is a clear strength, though reliance on self-report and a single sector limits how far the results generalize. The study supports my argument that hybrid models balance autonomy with connection, and its loneliness findings give me a counterpoint to studies that treat remote work as wholly positive.
Illustrative example of format; not a real article.
MLA 9th Example
In MLA 9th, the entry follows Works Cited format with a hanging indent, and the annotation is indented 1 inch from the left margin. The page is double-spaced, with the title "Annotated Bibliography" centered.
Ferreira, Lucia. Reading on Screens. Harbourside Press, 2021.
Ferreira argues that screen reading encourages skimming and weakens deep comprehension, combining classroom observation with a review of cognitive research. Her case is convincing for long, complex texts, but she says little about the benefits of digital annotation tools. I will use her historical framing in my introduction to contrast print and screen reading habits.
Illustrative example of format; not a real book.
Formatting at a Glance
| Element | APA 7th | MLA 9th |
|---|---|---|
| Page title | Annotated Bibliography, bold and centered | Annotated Bibliography, centered |
| Order | Alphabetical by first author | Alphabetical by first author |
| Citation | Hanging indent of 0.5 inches | Hanging indent of 0.5 inches |
| Annotation | Block indented 0.5 inches from the left margin | Indented 1 inch from the left margin |
| Spacing | Double throughout | Double throughout |
Annotation length is set by your tutor, not the style guide. Many briefs ask for around 100 to 200 words, and some ask for shorter descriptive notes.
Turning Weak Annotations into Strong Ones
| Weak | Stronger |
|---|---|
| "This article is about social media and teenagers." | "Using survey data from secondary school pupils, the authors link late-evening social media use with shorter sleep." |
| "This is a good source." | "The peer-reviewed design and large sample make this one of the more reliable studies on the topic." |
| "I will use this in my paper." | "This supports my section on sleep and contrasts with a study that found no effect, which I discuss in my limitations." |
From Annotated Bibliography to Literature Review
Many annotated bibliographies are a stepping stone to a bigger piece of work. If yours is, write each annotation with that next stage in mind.
- Tag each source by theme in your notes, such as "causes", "interventions" or "barriers".
- Note agreements and disagreements between sources while they are fresh in your mind.
- Record gaps: populations, settings or methods that no source covers.
- Flag your strongest sources, the ones you will lean on for central claims.
When you start the literature review, those tags let you group sources by theme straight away. The annotations become raw material for synthesis, instead of something you have to reread from scratch.
Common Mistakes
- Summary only: no judgment of quality or relevance.
- Copied abstracts: annotations must be in your own words.
- Off-topic sources: each source should connect clearly to your question.
- Formatting drift: mixed styles, missing hanging indents or wrong order.
- Uneven length: some annotations three lines, others half a page.
- Weak sources: unattributed websites where peer-reviewed work exists.
How EssayOasis Helps with Annotated Bibliographies
Send your topic or research question, the citation style, the number of sources, annotation length and any required readings. A matched writer finds real, relevant sources and writes a summary, evaluation and relevance note for each.
You receive a custom annotated bibliography, written from scratch and plagiarism-checked, to study and build your own research from. Free revisions within the scope of your original request are included.
Want a Custom Annotated Bibliography to Learn From?
Send your topic, style, number of sources and annotation length. A matched writer selects real, relevant sources and writes summary and evaluation for each.
Order Your Annotated BibliographyFree revisions · Full refund if late · Written from scratch for your order
Frequently Asked Questions
It depends on your brief. Many tutors ask for 100 to 200 words; some want short descriptive notes of 50 words or so.
Not usually. Some tutors ask for a short introduction explaining your research question and how you chose sources. Follow your brief.
Often yes, especially when explaining how you will use the source. Some tutors prefer a neutral voice, so check your guidance.
Your brief sets this. Common requests range from five to twenty sources, depending on level and purpose.
No. An annotated bibliography treats each source separately. A literature review synthesizes sources into a connected argument by theme.
Usually, yes. Longer annotations for complex sources can be split into two short paragraphs if your tutor allows.
By the first author's surname, or by title when there is no author, the same as a reference list.
Yes, as a starting point, but check each entry against the style guide. Generators often get capitalization and italics wrong.
Descriptive annotations say what the source covers. Evaluative annotations also judge its quality and usefulness for your research.
Yes, if they are credible and your brief allows them, such as reports from government bodies or professional organizations. Evaluate their authority and purpose carefully in the annotation.