PIPEFITTERS v. UNITED STATES. The Oyez Project at IIT Chicago-Kent College of Law. 13 February 2012. <http://www.oyez.org/cases/1970-1979/1971/1971_70_74>.
PIPEFITTERS v. UNITED STATES, The Oyez Project at IIT Chicago-Kent College of Law, http://www.oyez.org/cases/1970-1979/1971/1971_70_74 (last visited February 13, 2012).
"PIPEFITTERS v. UNITED STATES," The Oyez Project at IIT Chicago-Kent College of Law, accessed February 13, 2012, http://www.oyez.org/cases/1970-1979/1971/1971_70_74.