APA Style is used by writers in many disciplines around the world for concise, powerful, and persuasive scholarly communication. APA stands for the American Psychological Association. It's a consistent way for writers to document sources and avoid plagiarism. APA style does not provide a specific citation format. You will need to identify the source of the PDF (e.g. a book or a journal article) before you can cite it using the appropriate format. You can find clues in PDFs if you aren't sure which type of source you are dealing with. You might be able to find the name and publication of the PDF, which you can use to look up the source. You can always ask your instructor to clarify how to cite the PDF if you have received it from them. Below are the formats you will encounter for various source types in PDF format. Citing a book Online, you may find books [...]