LETTER CARRIERS v. AUSTIN. The Oyez Project at IIT Chicago-Kent College of Law. 13 February 2012. <http://www.oyez.org/cases/1970-1979/1973/1973_72_1180>.
LETTER CARRIERS v. AUSTIN, The Oyez Project at IIT Chicago-Kent College of Law, http://www.oyez.org/cases/1970-1979/1973/1973_72_1180 (last visited February 13, 2012).
"LETTER CARRIERS v. AUSTIN," The Oyez Project at IIT Chicago-Kent College of Law, accessed February 13, 2012, http://www.oyez.org/cases/1970-1979/1973/1973_72_1180.