Texas. Legislature. House of Representatives. 80th Texas Legislature, Regular Session, House Bill 3066, Chapter 1087, legislative document, June 15, 2007; (https://texashistory.unt.edu/ark:/67531/metapth155160/m1/1/: accessed February 22, 2019), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .