Nowak & Rotunda (2012), § 18.29(a)(i). Nowak, John E.; Rotunda, Ronald D. (2012). Treatise on Constitutional Law: Substance and Procedure (5th udgave). Eagan, Minnesota: West Thomson/Reuters. OCLC798148265.
Nowak & Rotunda (2012), § 18.29(b)(i). Nowak, John E.; Rotunda, Ronald D. (2012). Treatise on Constitutional Law: Substance and Procedure (5th udgave). Eagan, Minnesota: West Thomson/Reuters. OCLC798148265.