Click on the link above in the Media box to download the pdf handout, APA Sample Paper. Summary: APA (American Psychological Association) style is most commonly used to cite sources within the social sciences. This resource, revised according to the 6 th edition, second printing of the APA manual, offers examples for the general format of APA research papers, in-text citations, endnotes/footnotes, and the reference page. , 7 nd printing). Contributors: Joshua M. To see a side-by-side comparison of the three most widely used citation styles, including a chart of all APA citation guidelines, see the Citation Style Chart. You can also watch our APA vidcast series on the Purdue OWL YouTube Channel.