An annotated bibliography is a reference list where every entry is followed by a short paragraph — usually 100 to 200 words — saying what the source claims, how good the evidence is, and what it does for your project. It is a reading log with citations attached, not a pile of abstracts.
What it is for
Who reads it changes what belongs in it. There are three kinds of reader.
A marker. By far the most common case. APA 7 treats the annotated bibliography as a self-contained assignment and says the instructor sets the number of entries and the length of each annotation (§9.51). What the marker is checking is not that you found the sources — a search engine finds sources. It is that you read them and formed a view. So a pasted abstract leaves nothing for anyone to assess.
Yourself, later. This is not a finished artifact; it is the prep work for a literature review you have not written yet. Three months from now you will not remember why you saved Sana et al. (2013). The annotation records that judgement while it is still fresh. USC’s guide names this use directly — you may be asked for one “in preparation for a larger research and writing project.” Even when nobody assigns it, keeping your reading in this shape while you gather sources makes the later writing easier. For the stage before you dress it up in a citation style — deciding which parts of a paper to write down at all — see summarising papers.
Other researchers. Here the list is a guide for someone about to read into the field: a lab reading list, a syllabus, an appendix to a survey. It exists as a published form too — Oxford University Press runs Oxford Bibliographies, whose articles are expert-written, peer-reviewed annotated guides to the literature across more than 45 disciplines. Writing for this reader changes the target of the third function described below: you place the source in their project rather than in yours.
The example
The fastest way to understand one is to read one. Below is an example in full — three entries, then the same entry reformatted for MLA and Chicago.
These entries come from a bibliography on one question: does taking lecture notes by hand produce better learning than typing them? The style is APA 7, alphabetical by first author’s surname. In the document you hand in, the annotation is indented under each reference; the indented blocks below stand in for that indent.
Entry 1
Morehead, K., Dunlosky, J., & Rawson, K. A. (2019). How much mightier is the pen than the keyboard for note-taking? A replication and extension of Mueller and Oppenheimer (2014). Educational Psychology Review, 31(3), 753–780. https://doi.org/10.1007/s10648-019-09468-2
A direct replication, extended with groups who took notes on eWriters and who took no notes at all, that did not reproduce the headline result: some trends pointed to longhand, but test performance did not consistently differ between any of the groups — including, in the second experiment, the group that took no notes. A meta-analysis the authors run across the direct replications puts the longhand advantage at small and non-significant, and they conclude that calling either method superior is premature. This is the most important source in my bibliography, because it forces the review to be framed as an open question rather than as a finding to be reported.
Entry 2
Mueller, P. A., & Oppenheimer, D. M. (2014). The pen is mightier than the keyboard: Advantages of longhand over laptop note taking. Psychological Science, 25(6), 1159–1168. https://doi.org/10.1177/0956797614524581
Across three experiments with undergraduates, Mueller and Oppenheimer found that handwritten note-takers outperformed laptop note-takers on conceptual questions, and argued that the cause is encoding: longhand is too slow for transcription, so writers must reframe the lecture in their own words, while typists transcribe verbatim. This is the origin of the “pen is mightier” claim that almost all popular coverage repeats. Its limits matter here: samples of 67 to 151 students from two universities’ subject pools, and immediate testing in the first two studies — only Study 3 delayed the test by a week, and there longhand won only among students who were allowed to review their notes first. I treat it as the strongest statement of the encoding hypothesis rather than as settled evidence, and read it against Morehead et al. (2019) above.
Entry 3
Sana, F., Weston, T., & Cepeda, N. J. (2013). Laptop multitasking hinders classroom learning for both users and nearby peers. Computers & Education, 62, 24–31. https://doi.org/10.1016/j.compedu.2012.10.003
This paper moves the question from handwriting versus typing to what the laptop is being used for. In two experiments, multitasking on a laptop during a lecture lowered comprehension for the multitasker and — the striking result — for students seated within view of that screen. I include it because it names a confound running through the whole literature: a study comparing “laptop” with “handwriting” may be comparing distraction levels rather than encoding processes. It is also the only result here with a direct classroom-policy implication, and the one my discussion builds on.
What each sentence is doing
An annotation does three things. Entry 2 does all three, in order:
| Function | What it answers | Where it is in Entry 2 |
|---|---|---|
| Summarize | What is claimed, on what evidence? | “Across three experiments … transcribe verbatim.” |
| Assess | How strong is it, where does it stop? | “Its limits matter here … review their notes first.” |
| Reflect | What does it do for your project? | “I treat it as … read it against Morehead et al.” |
An annotation that does only the first is an abstract, and your marker has already read the abstract. The credit is in the second and third. A quick test: if someone who did not know your research question could have written it, the annotation is not doing its job.
It does not go in your paper’s reference list
This is the part that trips people up. A paper you submit — an article, a thesis — does not carry annotated references in its back matter. An annotated bibliography is a document in its own right; that is exactly why MLA asks for it to be titled Annotated Bibliography. What goes at the back of a paper is the bare references.
So where do the annotations go? You weave them into the prose. The three functions become sentences in your related-work section:
| The function in the annotation | What it becomes in the paper |
|---|---|
| Summarize | “Mueller and Oppenheimer (2014) attributed the longhand advantage to encoding.” |
| Assess | “Their samples were 67 to 151 students at two universities, and only Study 3 delayed the test.” |
| Reflect | “Because Morehead et al. (2019) did not replicate the result, I treat the question as open.” |
An annotated bibliography, in other words, is a draft of your related-work section written as a list. It stands alone as a submission, but on the way into a paper the annotations dissolve into prose while the list sheds them and becomes an ordinary reference list. Once you see that, the annotations stop being busywork: you are writing your paper early.
How the reference differs in MLA and Chicago
Only the reference changes. The annotation prose is identical.
MLA 9 — MLA asks that an annotated list be titled Annotated Bibliography or Annotated List of Works Cited:
Mueller, Pam A., and Daniel M. Oppenheimer. “The Pen Is Mightier Than the Keyboard: Advantages of Longhand over Laptop Note Taking.” Psychological Science, vol. 25, no. 6, 2014, pp. 1159–68, https://doi.org/10.1177/0956797614524581.
Chicago 18 author-date, under a heading called References:
Mueller, Pam A., and Daniel M. Oppenheimer. 2014. “The Pen Is Mightier Than the Keyboard: Advantages of Longhand over Laptop Note Taking.” Psychological Science 25 (6): 1159–68. https://doi.org/10.1177/0956797614524581.
| APA 7 | MLA 9 | Chicago 18 (author-date) | |
|---|---|---|---|
| Heading on a plain list | References | Works Cited | References |
| Author names | Surname + initials | Surname, full given name | Surname, full given name |
| Year position | After the authors, in parentheses | After the volume and issue | After the authors, no parentheses |
| Article title | Sentence case, no quotation marks | Title Case, in quotation marks | Title Case, in quotation marks |
| Volume / issue | 25(6) | vol. 25, no. 6 | 25 (6) |
| Three or more authors | All listed, up to 20 | First author + “et al.” | All listed, up to a cut-off |
| Annotation goes | New paragraph, indented under the entry | New line with a paragraph indent, or run in after the entry | New indented line, or run in after the entry |
Two cautions. First, Chicago has two systems. Notes-bibliography, headed Bibliography, moves the year out of the author slot into parentheses after the volume and issue; author-date is shown above. Second, numeric styles such as IEEE and Vancouver order the list by citation order rather than alphabetically, which is why annotated bibliographies are almost never set in them.
Manuals also get revised, and departments add house rules, so the sheet your marker is holding beats this table.
Length, order, and kind
- Per annotation: most assignments ask for 100 to 200 words; some ask for two sentences.
- Order: alphabetical by first author’s surname in APA, MLA, and Chicago, exactly as a plain reference list would run. MLA also allows arranging the list by date of publication or by subject; elsewhere, group by theme only if asked.
- Kind: descriptive annotations summarize; evaluative ones also judge and place the source. Most assignments want the evaluative kind without saying so.
Four mistakes that cost marks
- Pasting the abstract. The most detectable plagiarism in this genre. It also leaves nothing for the marker to assess.
- Annotations that never mention your project. An annotation exists to say what the source does for your own research. One that never mentions your research is not serving that purpose.
- Mixing styles. Apply the same style to every entry.
- Wrong metadata. Page ranges, issue numbers, and DOIs take seconds to verify, which is exactly why a marker spot-checks them.
Doing this without retyping every reference
Part of this assignment is mechanical: finding sources, keeping their metadata correct, and rendering it in the right style. Writing the annotations is not, but everything around them is worth automating. In Litlas that part maps onto the product directly:
- Save and annotate together. Search indexed sources including OpenAlex, Crossref, PubMed, and arXiv, save a paper to a board for the assignment, and write the annotation in that item’s personal note in your library.
- Format the reference. APA, Chicago (author-date), IEEE, MLA, and Vancouver, rendered from the paper’s stored metadata. Set the style once and every citation you insert uses it.
- Assemble it in a document. In a Litlas document — rich text or LaTeX — “cite from your library” inserts the in-text citation plus the formatted reference entry, and you type the annotation underneath.
- Output it as an annotated list. Open “Cite / bibliography” on your library or a board and switch on “add my notes”: each formatted reference is followed by the note you saved for that paper. The order follows the style you picked (alphabetical by first author’s surname in APA, MLA, and Chicago). Each note is matched to its own paper, so re-sorting never puts a note under the wrong reference. Papers you have not annotated stay in the list as bare references. Export the list as a Markdown or LaTeX file.
- Or export and finish elsewhere. Export your library, or one board, as a
single BibTeX file. Your note travels in the BibTeX
notefield, so annotations arrive with the references instead of being retyped. (A single paper’s Cite panel also exports RIS and CSL-JSON, but those carry the paper’s metadata only — not your note.)
The free plan needs no card and works right away.
One property suits this assignment particularly well: the annotation stays yours to write. The ✨ button hands a paper off to Gemini, ChatGPT, Claude, or Gemini Notebook in your own account; nothing is summarized on Litlas servers to fill the box for you. An annotation written by a model that has not read your brief is exactly what markers look for. With a correct reference and your own note both in hand, Litlas assembles the annotated list for you, so the time goes into the annotations themselves. The five styles are APA, Chicago (author-date), IEEE, MLA and Vancouver, so the only list you format yourself is one where the assignment names Chicago’s notes system.
Annotated bibliographies get assigned because they are hard to fake. The references prove you found the sources; the annotations prove you read them and formed a view. Automate the first half, and spend what you save on the second.
Bibliography
- American Psychological Association. Publication Manual of the American Psychological Association. 7th ed., American Psychological Association, 2020, §9.51.
- Modern Language Association of America. MLA Handbook. 9th ed., Modern Language Association of America, 2021.
- Oxford University Press. “About Oxford Bibliographies.” https://academic.oup.com/oxford-bibliographies/pages/about. Accessed 20 August 2026.
- University of Chicago Press. The Chicago Manual of Style. 18th ed., University of Chicago Press, 2024.
- USC Libraries. “Annotated Bibliography.” Organizing Your Social Sciences Research Assignments. https://libguides.usc.edu/writingguide/assignments/annotatedbibliography. Accessed 20 August 2026.