APSA Style is a modified version of the Chicago Manual of Style (15th ed.; author-date variation) developed by the American Political Science Association.
Use author-date information for an in-text citation, e.g. (Bailey 1987) or (Smith 1975, 135) or "... " according to Smith (1975, 189). No comma is placed between author and year. Page numbers should not use a p/pp/pg prefix.
Author. Year. "Title of Article." Journal Title, vol. # (issue #). URL/permalink (Access date).
Bogaards, Matthijs. 2010. "Measures of Democratization: From Degree to Type to War." Political Research Quarterly 63 (2). http://www.jstor.org/stable/20721505 (Accessed October 29, 2018).
Example from the style manual (p. 26):
Browning, Tonya. 1997. "Embedded Visuals: Student Design in Web Spaces." Kairos: A Journal for Teachers of Writing in Webbed Environments 3 (1). http://english.ttu.edu/-kairos/2.1/features/browning/index.html (Accessed October 21, 1997).
Author(s). YYYY. "Title of Article." Title of Complete Work. Month DD. URL (access date).
Example from the style manual (p. 32):
King, Gary, Michael Tomz, and Jason Wittenberg. 1998. "Making the Most of Statistical Analyses: Improving Interpretation and Presentation." September 7. http://gking.harvard.edu/preprints.shtml (October 22, 1998).
Author. YYYY. Title of Book. Xth ed. City, State: Publisher. URL.
Charles, Patrick J. 2018. Armed in America : A History of Gun Rights From Colonial Militias to Concealed Carry. Amherst, NY: Prometheus Books. http://lscsproxy.lonestar.edu/login?url=http://search.ebscohost.com/login.aspx?direct=true&AuthType=ip,cpid&custid=s1088435&db=nlebk&AN=1500676&site=ehost-live.