Texas. Legislature. Senate. 81st Texas Legislature, Senate Bill 1967, Chapter 1391, Legislative Document, June 19, 2009; (http://texashistory.unt.edu/ark:/67531/metapth149490/ : accessed August 28, 2015), 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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