The entire APSA style manual is also available for free online from the APSA website. Click on the link above to view the PDF.
APSA stands for the American Political Science Association. It is the citation style used by many political science scholars and is primarily based on Chicago Style (seventeenth edition) but gives special attention to documents produced within the United States government. It is the style used in all APSA journals.
There is a specific formatting style required by APSA, as well as two parts to how you must cite sources, which are:
Parenthetical in-text author-date system directing readers to the reference list.
A reference list which appears at the end of the text.