Determine the title and author of the document you are citing. This should be on the front page. If the information is not included with the PDF, refer to the website where you obtained the PDF.
Find the title of the publication where the document appeared. While this information may be contained in the PDF, it can most likely be found on the website from where the PDF was downloaded.
Copy the URL of the PDF you downloaded, if it is available.
Assemble this information in the appropriate order and format according to the citation style you are using. Follow the templates for citing a book or article contained in the style's manual.
Append "PDF" to the end of the citation, followed by the PDF's URL if available. The URL is especially important if the document is not available offline.
Add the name of the online database the article was accessed at, such as JSTOR, if it was found on such a database. You need not use the word "Web" in your citation, as a PDF citation infers that the source was found online.