CHICAGO, M., ST. P. & P. R. CO. v. U.S.. The Oyez Project at IIT Chicago-Kent College of Law. 16 May 2012. <http://www.oyez.org/cases/1960-1969/1960/1960_306>.
CHICAGO, M., ST. P. & P. R. CO. v. U.S., The Oyez Project at IIT Chicago-Kent College of Law, http://www.oyez.org/cases/1960-1969/1960/1960_306 (last visited May 16, 2012).
"CHICAGO, M., ST. P. & P. R. CO. v. U.S.," The Oyez Project at IIT Chicago-Kent College of Law, accessed May 16, 2012, http://www.oyez.org/cases/1960-1969/1960/1960_306.