UNITED STATES v. PENNSYLVANIA CHEM. CORP.. The Oyez Project at IIT Chicago-Kent College of Law. 12 February 2012. <http://www.oyez.org/cases/1970-1979/1972/1972_72_624>.
UNITED STATES v. PENNSYLVANIA CHEM. CORP., The Oyez Project at IIT Chicago-Kent College of Law, http://www.oyez.org/cases/1970-1979/1972/1972_72_624 (last visited February 12, 2012).
"UNITED STATES v. PENNSYLVANIA CHEM. CORP.," The Oyez Project at IIT Chicago-Kent College of Law, accessed February 12, 2012, http://www.oyez.org/cases/1970-1979/1972/1972_72_624.