This Nation
This nation.com: New York Times Co. V. Sullivan (1964)
This site from ThisNation.com provides Justice William J. Brennan, Jr.'s full text of the Supreme Court's decision in this landmark case.
Thomson Reuters
Find Law: u.s. Supreme Court: New York Times v. Sullivan (1964)
Provides a brief summary and the text of Chief Justice Brennan's opinion of the Supreme Court in this case involving libel.