A bibliography is an organised, alphabetised list of sources relevant to a piece of scholarly work, placed at the end of a document. Depending on the convention in use, a bibliography may list only the sources cited or may also include background works consulted but not directly cited. Its purpose is to record the intellectual context of a work and let readers locate every source behind it.
The word carries more than one meaning in scholarship. In some citation systems “bibliography” is the standard name for the end-of-document source list; in others it is distinguished sharply from a reference list. Understanding which sense applies is the first step to compiling one correctly.
Bibliography versus reference list
The clearest way to grasp a bibliography is to set it against the reference list it is often confused with.
| Feature | Reference list | Bibliography |
|---|---|---|
| Contents | Only sources cited in the text | May include cited and uncited background reading |
| Mapping to text | One-to-one with in-text citations | Need not map to every in-text marker |
| Typical styles | APA, Vancouver (as “References”) | Chicago notes-bibliography, MLA (“Works Cited”) |
A reference list answers the question “what did you cite?” A bibliography can answer the broader question “what shaped this work?” The mapping between in-text markers and entries is covered in in-text citations versus the reference list.
Types of bibliography
Enumerative bibliography
The most common form: a straightforward list of sources, alphabetised by author surname, each entry formatted to a chosen style. This is what most students and researchers mean by “a bibliography”.
Annotated bibliography
Each entry is followed by a short paragraph — the annotation — that summarises the source, evaluates its relevance or quality, and notes how it relates to the project. Annotated bibliographies are common in literature reviews and proposals, where the reader benefits from the author’s assessment of each source.
Analytical and descriptive bibliography
A specialist scholarly field concerned with books as physical objects — their printing, editions and material history. This sense is distinct from the everyday end-of-paper list and belongs to textual scholarship rather than routine citation.
How to compile a bibliography
Compiling a reliable bibliography is a disciplined, repeatable process.
- Record sources as you read. Capture full bibliographic detail — author, year, title, container, publisher and a persistent identifier such as a DOI — at the moment you consult each source, not afterwards from memory.
- Choose one citation style and apply it consistently. The required elements are stable, but their order and punctuation are not. See citation styles compared to select the right one.
- Decide cited-only or cited-plus-background. Confirm whether your style and assignment want a reference list or a fuller bibliography, then include sources accordingly.
- Alphabetise and format. Order entries by the first author’s surname and apply a hanging indent so each entry is easy to scan.
- Verify every entry. Check that each persistent identifier resolves and that names are disambiguated — an ORCID iD helps distinguish authors with similar names.
How to order and format entries
Most enumerative bibliographies are ordered alphabetically by the lead author’s surname. Where an author has several works, they are usually ordered by year. Numeric systems such as Vancouver are an exception: there the list is ordered by the sequence of first appearance in the text, not alphabetically. Each entry typically uses a hanging indent, and titles, journals and books are styled per the chosen system.
| System | Ordering principle |
|---|---|
| Author–date (APA, Chicago author–date) | Alphabetical by surname, then by year |
| MLA Works Cited | Alphabetical by first listed name or title |
| Numeric (Vancouver) | By order of citation in the text |
Relationship to works cited and references
“Works Cited” is MLA’s name for its end-of-paper list and contains only cited sources, making it functionally a reference list rather than a full bibliography. Knowing the vocabulary your discipline uses prevents the common error of mixing background reading into a list that should be cited-only. Sound bibliographies also support research integrity, because a complete, accurate source list lets others verify and build on your work.
Frequently asked questions
Is a bibliography the same as a reference list?
Not always. A reference list contains only the sources you cited. A bibliography may also include background works you read but did not cite. Some styles, however, use “bibliography” as the name for what others call a reference list, so always check your style’s convention.
What is an annotated bibliography?
An annotated bibliography adds a short evaluative paragraph after each entry, summarising the source and explaining its relevance. It is common in literature reviews and research proposals where readers benefit from the author’s assessment of each work.
How do I order a bibliography?
Most bibliographies are alphabetised by the lead author’s surname, then by year for multiple works by the same author. Numeric systems such as Vancouver are the exception and order entries by their first appearance in the text.
Where can I find standardised definitions of these terms?
Consult the CASRAI dictionary for standardised definitions, and our explainer on what a citation is for how individual references fit together.