Texas. Legislature. House of Representatives. 79th Texas Legislature, Regular Session, House Bill 1599, Chapter 581, legislative document, June 17, 2005; (https://texashistory.unt.edu/ark:/67531/metapth156563/m1/1/: accessed November 20, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .