Texas. Legislature. Senate.. 81st Texas Legislature, Senate Bill 2279, Chapter 853, Legislative Document, June 19, 2009; digital images, (http://texashistory.unt.edu/ark:/67531/metapth149536/ : accessed December 04, 2013), University of North Texas Libraries, The Portal to Texas History, http://texashistory.unt.edu; crediting UNT Libraries Government Documents Department, Denton, Texas.
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