GROPPI v. WISCONSIN. The Oyez Project at IIT Chicago-Kent College of Law. 12 February 2012. <http://www.oyez.org/cases/1970-1979/1970/1970_26>.
GROPPI v. WISCONSIN, The Oyez Project at IIT Chicago-Kent College of Law, http://www.oyez.org/cases/1970-1979/1970/1970_26 (last visited February 12, 2012).
"GROPPI v. WISCONSIN," The Oyez Project at IIT Chicago-Kent College of Law, accessed February 12, 2012, http://www.oyez.org/cases/1970-1979/1970/1970_26.