OTTER TAIL POWER CO. v. UNITED STATES. The Oyez Project at IIT Chicago-Kent College of Law. 26 April 2013. <http://www.oyez.org/cases/1970-1979/1972/1972_71_991>.
OTTER TAIL POWER CO. v. UNITED STATES, The Oyez Project at IIT Chicago-Kent College of Law, http://www.oyez.org/cases/1970-1979/1972/1972_71_991 (last visited April 26, 2013).
"OTTER TAIL POWER CO. v. UNITED STATES," The Oyez Project at IIT Chicago-Kent College of Law, accessed April 26, 2013, http://www.oyez.org/cases/1970-1979/1972/1972_71_991.