Assuming you mean [the style guide of the American Psychological Association (APA)][1], there is a link on the Wikipedia page to the [APA style website][2].

In-Text Citations are explained on [the linked page][3]:

> - If there is no author, use the title (or a short form of the title, if it is lengthy) and the year. Titles that are italicized in the reference list are italicized in text; titles that are not italicized in the reference list appear in quotation marks.

So the answer to _Do I italicize or quote the title of a PDF for a citation?_ is either use italics or quotation marks, but be consistent.

The answer to _How do I simply always find the most recent and official English citation format for a scholarly PDF?_ is use the [APA style website][2], if you only want APA style guides.


[1]: https://en.wikipedia.org/wiki/APA_style
[2]: http://apastyle.org/
[3]: http://www.apastyle.org/learn/quick-guide-on-references.aspx#In-Text