This article was reviewed by Gerald Posner and by wikiHow staff writer, Jennifer Mueller, JD. Gerald Posner is an Author & Journalist based in Miami, Florida. With over 35 years of experience, he specializes in investigative journalism, nonfiction books, and editorials. He holds a law degree from UC College of the Law, San Francisco, and a BA in Political Science from the University of California-Berkeley. He’s the author of thirteen books, including several New York Times bestsellers, the winner of the Florida Book Award for General Nonfiction, and has been a finalist for the Pulitzer Prize in History. He was also shortlisted for the Best Business Book of 2020 by the Society for Advancing Business Editing and Writing.
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If you're writing a research paper, you might want to use a PDF file as a source. With the American Psychological Association (APA) citation style, how you cite the PDF file depends on whether it's freely available online or was sent to you personally. Specifically, if the PDF file was sent to you personally, or if you downloaded it from a website that isn't open to the public, you would only use an in-text citation, not a Reference List entry.