U.S. GYPSUM CO. v. NAT. GYPSUM CO.. The Oyez Project at IIT Chicago-Kent College of Law. 12 February 2012. <http://www.oyez.org/cases/1950-1959/1956/1956_11>.
U.S. GYPSUM CO. v. NAT. GYPSUM CO., The Oyez Project at IIT Chicago-Kent College of Law, http://www.oyez.org/cases/1950-1959/1956/1956_11 (last visited February 12, 2012).
"U.S. GYPSUM CO. v. NAT. GYPSUM CO.," The Oyez Project at IIT Chicago-Kent College of Law, accessed February 12, 2012, http://www.oyez.org/cases/1950-1959/1956/1956_11.