KAUFMAN v. UNITED STATES. The Oyez Project at IIT Chicago-Kent College of Law. 26 April 2013. <http://www.oyez.org/cases/1960-1969/1968/1968_53>.
KAUFMAN v. UNITED STATES, The Oyez Project at IIT Chicago-Kent College of Law, http://www.oyez.org/cases/1960-1969/1968/1968_53 (last visited April 26, 2013).
"KAUFMAN v. UNITED STATES," The Oyez Project at IIT Chicago-Kent College of Law, accessed April 26, 2013, http://www.oyez.org/cases/1960-1969/1968/1968_53.