To find case citations for United States Supreme Court Cases, go to Oyez Law Project and type your case name in the search box. Once you have found your case you should see the citation listed.
Estes v. Texas, 381 U.S. 532 (1965).
---Cite in text: (Estes v. Texas, 1965)
Harper & Row v. Nation Enterprises, 471 U.S. 539 (1985).
---Cite in text: (Harper v. Nation, 1985)
These cases are the same as the Supreme Court cases with one edition; you must add the name of the court.
Barnes v. Yahoo Inc., 570 F.3d 1096 (9th Cir. 2009).
---Cite in text: (Barnes v. Yahoo, 2009)
Sunset Harbour v. Robbins, 914 So. 2d 925 (Fla 2005).
---Cite in text: (Sunset Harbour v. Robbins, 2005)