When citing legal materials, APA style follows the legal citation style outlined in The Bluebook: A Uniform System of Citation.
Reference form for cases:
Name v. Name, Volume Source Page (Court Date).
Sample reference to cases decided by the U.S. Supreme Court:
Brown v. Board of Educ., 347 U.S. 483 (1954).
Maryland V. Craig, 110 S. Ct. 3160 (1990).
(From section A7.03 Court Decisions of the 6th edition of the APA style guide.)
You may use the "Cite" features in the databases, but be forewarned: They are not always correct! It's on you to verify that the citations you use are in proper APA format!
Resources for verifying your citations are correct: