BUTLER v. MICHIGAN. The Oyez Project at IIT Chicago-Kent College of Law. 26 April 2013. <http://www.oyez.org/cases/1950-1959/1956/1956_16>.
BUTLER v. MICHIGAN, The Oyez Project at IIT Chicago-Kent College of Law, http://www.oyez.org/cases/1950-1959/1956/1956_16 (last visited April 26, 2013).
"BUTLER v. MICHIGAN," The Oyez Project at IIT Chicago-Kent College of Law, accessed April 26, 2013, http://www.oyez.org/cases/1950-1959/1956/1956_16.