Texas. Legislature. House of Representatives. 80th Texas Legislature, Regular Session, House Bill 3407, Chapter 1100, legislative document, June 15, 2007; (https://texashistory.unt.edu/ark:/67531/metapth155237/m1/1/: accessed November 14, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .