Unenacted federal bills & resolutions:
Title, bill or resolution number, xx Cong. (year).
National Fish and Wildlife Foundation Reauthorization Act of 2013, S. 51, 113 Cong. (2014).
Enacted bills and resolutions:
Name of the Statute, Title number Source § Section number(s) (Year).
Family and Medical Leave Act of 1993, 29 U.S.C. §§ 2601–2654 (2006).
Need more help on legal citations? http://blog.apastyle.org/apastyle/2013/02/introduction-to-apa-style-legal-references.html