Boundaries of UnitedStates Courts of Appeals and UnitedStates District Courts” (PDF). US: Courts. October 18, 2009閲覧。 ^ “2008 Presidential Election”. Electoral
Current UnitedStates Law”. University of Oklahoma. http://thorpe.ou.edu/guide/robertson.html 2007年8月21日閲覧。 ^ “Presidential Election of 2004 in Oklahoma”