Texas. Legislature. House of Representatives. 82nd Texas Legislature, Regular Session, House Bill 1756, Chapter 985, legislative document, June 17, 2011; (https://texashistory.unt.edu/ark:/67531/metapth311095/m1/1/: accessed December 16, 2017), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .