Q. How do I cite the PDF for an article I found with a Google search?

For MLA, see the links below from the MLA Style Center. 

For APA, there is no special PDF format.  Instead, do the following:

1. Identify the type of source you’re citing (e.g., report, book, journal article, etc.).

2. Create a citation using APA’s format for that source type.

3. Include the PDF link. This is enough to indicate to the reader that this source is a PDF.