Texas. Legislature. House of Representatives. 82nd Texas Legislature, Regular Session, House Bill 1274, Chapter 747, legislative document, June 17, 2011; (https://texashistory.unt.edu/ark:/67531/metapth310988/m1/1/: accessed May 21, 2019), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .