How to Reference a PDF Document in Your Writing

What referencing a PDF means and why you need to do it

Referencing a PDF document means telling your reader where you found information — the author, title, publication date, and web address or file location. When you quote, paraphrase, or build an argument on something you read in a PDF, you give credit to the original source and let your reader find it themselves if they want to verify what you said.

You need to reference PDFs the same way you reference books, articles, or websites. The format changes slightly depending on which citation style your school, workplace, or publication uses — usually MLA, APA, or Chicago. The core information stays the same: who wrote it, what it's called, when it came out, and where to find it.

The most common mistake is treating a PDF differently from any other source just because it's digital. A PDF is a file format, not a source type. A PDF can be a journal article, a government report, a book chapter, or a newspaper piece. You reference what it is, not what it's stored as.

Key Takeaways

Reference a PDF using the same format as you would the original source — a journal article PDF uses journal citation rules, not special PDF rules.
Gather the author name, document title, publication date, publisher or website, and the URL or DOI (a permanent identifier) before you write your reference.
MLA, APA, and Chicago styles each have slightly different formats, so check which one your school or workplace requires.
If the PDF has no author listed, start with the title and move the publication date earlier in the citation.
A DOI (Digital Object Identifier) is more stable than a URL, so use it if the PDF shows one.

Gathering the information you need before you cite

Before you write a reference, collect these details from the PDF itself. Open the file and look at the first page, the title page, and the end of the document.

Author name: Look for the author or authors listed near the title. If it's a government report or organization publication, the agency name may be the author. If no author appears anywhere, you'll note that in your citation.

Document title: Write down the exact title as it appears on the PDF, including any subtitle. This is usually on the first or title page.

Publication date: Find the year the document was published. This might be on the title page, in a copyright notice at the bottom of the first page, or in the document properties. If you can't find a publication date, note that too — your citation will say "n.d." (no date).

Publisher or source: Note where the PDF came from. If it's from a journal, write down the journal name, volume, and issue number. If it's from a website, note the website name. If it's a book, note the publisher.

URL or DOI: A DOI is a permanent identifier that looks like "10.1234/example". If the PDF shows a DOI, copy it exactly — it won't change if the website moves. If there's no DOI, copy the full URL from your browser's address bar. If you downloaded the PDF and don't have a URL, note that you accessed it locally.

How to format a reference in MLA style

MLA (Modern Language Association) is the most common format for high school and undergraduate writing. The basic structure is: Author. "Title of Document." Name of Website or Publication, Date, URL or DOI.

Here's a real example: Smith, John. "Climate Change and Coastal Erosion." Environmental Science Quarterly, 2022, doi:10.1234/esq.2022.001.

If the PDF is from a website and not a journal, the format is similar but you include the website name: Johnson, Maria. "How to Reduce Household Waste." Green Living Today, 15 Mar. 2023, www.greenlivingtoday.com/reduce-waste.

If there's no author, start with the title: "Guide to Local Zoning Laws." City of Portland Planning Department, 2021, www.portlandplanning.gov/zoning-guide.

How to format a reference in APA style

APA (American Psychological Association) is standard in social sciences, psychology, and education. The basic structure is: Author, A. A. (Year). Title of document. Publisher or Source. URL or DOI.

Here's a real example: Smith, J. (2022). Climate change and coastal erosion. Environmental Science Quarterly, 45(3), 234–250. https://doi.org/10.1234/esq.2022.001

Notice that APA puts the year in parentheses right after the author, capitalizes only the first word of the title, and uses a DOI with the full "https://doi.org/" prefix. If the PDF is from a website without a DOI: Johnson, M. (2023, March 15). How to reduce household waste. Green Living Today. Retrieved from https://www.greenlivingtoday.com/reduce-waste

If there's no author, start with the year and title: City of Portland Planning Department. (2021). Guide to local zoning laws. https://www.portlandplanning.gov/zoning-guide

How to format a reference in Chicago style

Chicago style is used in history, some humanities fields, and business writing. It has two systems: notes-bibliography (for humanities) and author-date (for sciences). The notes-bibliography format is: Author First Name Last Name, "Title of Document," Publication Name, Date, URL or DOI.

Here's a real example in notes-bibliography: John Smith, "Climate Change and Coastal Erosion," Environmental Science Quarterly 45, no. 3 (2022): 234–250, https://doi.org/10.1234/esq.2022.001.

The author-date system (used more often in sciences) looks like: Smith, John. 2022. "Climate change and coastal erosion." Environmental Science Quarterly 45, no. 3: 234–250. https://doi.org/10.1234/esq.2022.001.

Chicago style is more flexible about PDFs from websites. If you're citing a government report or organizational PDF, include the organization as the author: City of Portland Planning Department. 2021. Guide to Local Zoning Laws. https://www.portlandplanning.gov/zoning-guide.

What to do when the PDF is missing information

Real PDFs often lack one or more pieces of information. Government documents might have no author name. Old scanned articles might have no DOI. Here's how to handle the gaps.

If there's no author, use the organization or publisher name instead, or start with the title if no organization is listed. If there's no publication date, write "n.d." in MLA and Chicago, or "(n.d.)" in APA. If there's no URL or DOI, note that you accessed the file locally — in MLA you can write "PDF file" at the end, and in APA you can note "Retrieved from [local file]" or similar language.

If the PDF is a scanned image of an old book or article and you found it through a library database, cite the original publication information if you can find it, then add the database name and access date. Your librarian can help you format this correctly for your citation style.

How to cite a PDF when you quote or paraphrase

In your actual writing, you also need an in-text citation — a short note that tells your reader which source you're using right now. This is different from the full reference at the end.

In MLA, put the author's last name and the page number in parentheses: (Smith 45). If the PDF has no page numbers, use the paragraph number or section heading instead: (Smith, "Climate Change" sec. 3). In APA, include the author, year, and page: (Smith, 2022, p. 45). In Chicago notes-bibliography, use a footnote or endnote with the author, title, and page number.

If you're paraphrasing instead of quoting directly, you still need the in-text citation, but you don't need quotation marks. The full reference at the end is the same either way.

Frequently Asked Questions

Do I cite a PDF differently than a printed book?

No. A PDF is just the file format. If the PDF is a book, you cite it as a book. If it's a journal article, you cite it as a journal article. The only difference is that you include the URL or DOI at the end so your reader can find the digital version.

What if the PDF doesn't show a publication date?

Use "n.d." (no date) in MLA and Chicago style, or "(n.d.)" in APA. If the PDF is from a website and the website shows when the page was last updated, you can use that date instead. Always note in your reference that the date is missing or approximate.

Should I use the URL or the DOI?

Use the DOI if it's available — it's a permanent identifier that won't break if the website moves. If there's no DOI, use the full URL from your browser's address bar. Never shorten a URL unless your citation style specifically allows it.

Can I cite a PDF I downloaded to my computer without a URL?

Yes, but note that you accessed it locally. In MLA, you can end the citation with "PDF file." In APA, you can note where you found it originally (a website, a library database, an email) if you remember. If you have no source information at all, ask your teacher or editor what to do.

What if the PDF is from a government website with no clear author?

Use the government agency or department as the author. For example: "U.S. Environmental Protection Agency" or "City of Portland Planning Department." This tells your reader exactly where the document came from.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.