Referendum. State ofGeorgia. 2004-07-07 [2007-10-07]. (原始内容存档于2012-03-18). Provisions of the OfficialCodeofGeorgiaAnnotated Relative to Georgia, U.S., and
the Secretary of State, Missouri – State Symbols. State of Missouri. [2009-11-12]. (原始内容存档于2012-08-17). State Gem, Montana CodeAnnotated section 1-1-501
Statutes §5-10. [2017-10-19]. (原始内容存档于2003-01-16). State Songs of the United States: An Annotated Anthology. Psychology Press. 1997. ISBN 9780789003973 (英语)