Texas. Legislature. House of Representatives. 83rd Texas Legislature, Regular Session, House Bill 847, Chapter 649, legislative document, June 14, 2013; (https://texashistory.unt.edu/ark:/67531/metapth439087/m1/1/: accessed May 23, 2019), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .