A bibliography is a list of every source you used or consulted while writing a paper, organized alphabetically and formatted according to a specific style. Building one comes down to collecting four pieces of information for each source (author, date, title, and where it was published), then arranging those pieces in the pattern your style guide requires. The process is straightforward once you understand the underlying logic.
What Goes Into Every Entry
Regardless of which formatting style you follow, every bibliography entry is built from the same four core elements:
- Author: The person or organization that created the work. List the last name first, followed by initials or first name depending on the style.
- Date: The year the work was published, and sometimes the full date for web content or news articles.
- Title: The name of the article, book, chapter, or webpage. Formatting rules (italics, quotation marks, capitalization) vary by style.
- Source: Where the work lives. For a book, this is the publisher. For a journal article, it is the journal name, volume, issue, and page numbers. For a website, it is the site name and URL.
Think of these four elements as slots you fill in for every source. The differences between styles are mostly about punctuation, ordering, and small details like whether you write out a full first name or just use an initial.
Bibliography vs. References vs. Works Cited
These three terms look interchangeable, but they mean slightly different things. A references page or works cited page lists only the sources you directly quoted or paraphrased in your paper. A bibliography is broader: it can include sources you read for background or recommend for further reading, even if you never cited them in the text. Some instructors also assign annotated bibliographies, where each entry includes a short paragraph summarizing the source and explaining why it is relevant.
If your assignment says “references” or “works cited,” stick to sources you actually referenced. If it says “bibliography,” you have room to include background reading as well. When in doubt, ask your instructor which one they expect.
Formatting a Book Entry
Books are the most common source type, and the entry is simple. You need the author’s name, the year of publication, the title (in italics), and the publisher. If the book has an edition number or volume number, include that in parentheses right after the title. You no longer need to include the publisher’s city in most styles.
In APA style, a book entry looks like this:
Smith, J. R. (2022). The history of modern design (3rd ed.). Oxford University Press.
In MLA style, the same book would look different. MLA uses the author’s full first name, italicizes the title, and places the publisher and year at the end separated by commas. The key is picking one style and applying it consistently to every entry.
Formatting a Journal Article
Journal articles need a few more details than books. After the author and date, you list the article title (not italicized in APA, placed in quotation marks in MLA), followed by the journal name in italics, the volume number, the issue number, and the page range. If the article has a DOI (a permanent digital identifier that looks like a URL starting with https://doi.org/), include it at the end.
An APA-style journal article entry:
Garcia, L., & Chen, W. (2021). Effects of sleep deprivation on memory recall. Journal of Cognitive Psychology, 14(3), 112–128. https://doi.org/10.xxxx/example
Notice that multiple authors are separated by commas, with an ampersand (&) before the last name rather than the word “and.”
Formatting a Website
Website citations trip people up because web content often lacks a clear author or publication date. Start by looking for a byline. If the author is an organization (a government agency, a nonprofit, a company), use the organization’s name as the author. The title of the specific page goes in italics, followed by the website name and the URL.
When the author and the website name are the same, you do not need to repeat it. For example, if the Centers for Disease Control and Prevention published a page on its own site, you would list the CDC as the author and skip listing the site name separately.
If there is no date at all, most styles let you write “n.d.” (no date) in place of the year.
Handling Multiple Authors
For two authors, list both names separated by a comma and an ampersand. For three to twenty authors, list every name, separating them with commas and placing an ampersand before the final name. If a source has more than twenty authors, list the first nineteen, insert an ellipsis, and then add the very last author’s name.
When you have multiple works by the same author, list them in chronological order, earliest first. Repeat the author’s name for each entry rather than substituting a dash or abbreviation.
Citing AI-Generated Content
If you used a tool like ChatGPT, DALL-E, or another generative AI program, most style guides now have specific rules for citing it. MLA style recommends against listing the AI tool as the author. Instead, you describe what was generated (including your prompt if relevant) as the title, name the AI tool as the container, specify the model version, list the company that makes the tool as the publisher, give the date you generated the content, and provide a shareable URL if the tool offers one.
One important caution: AI tools sometimes fabricate sources or misrepresent what a real source says. If an AI response points you to a book or article, look up that source directly and cite it yourself rather than trusting the AI’s summary.
Alphabetizing and Organizing the List
Bibliography entries are arranged alphabetically by the first element of each entry, which is usually the author’s last name. If there is no author, alphabetize by the first significant word of the title (skip “A,” “An,” and “The”). A few practical rules to keep in mind:
- Group authors: Spell out the full name of the organization. If the organization has a parent agency, list the most specific group as the author.
- No author: Move the title into the author position and alphabetize by that title.
- Same author, different years: List the older work first.
Start your bibliography on a new page. Center the heading (“References,” “Works Cited,” or “Bibliography” depending on the style) at the top. Each entry typically uses a hanging indent, meaning the first line is flush with the left margin and every subsequent line of that entry is indented half an inch. Double-space the entire list in both APA and MLA.
Step-by-Step Process
Pulling it all together is easier if you build your bibliography as you research rather than scrambling at the end. Here is a practical workflow:
- Step 1: Every time you read a source, record the author, date, title, and publication details immediately. A simple spreadsheet or document works fine.
- Step 2: Confirm which style your assignment requires (APA, MLA, Chicago, or another). Your syllabus or assignment prompt will specify this.
- Step 3: Format each entry according to that style’s rules for the source type (book, article, website, etc.).
- Step 4: Alphabetize all entries by the first word of each citation.
- Step 5: Apply hanging indentation and double spacing, then place the completed list on its own page at the end of your paper.
If you are working with a lot of sources, citation management tools like Zotero or the built-in citation features in Google Docs and Microsoft Word can automate much of the formatting. These tools are free and save time, but always double-check the output against your style guide. Automated tools occasionally produce errors in italicization, capitalization, or punctuation.