Texas. Legislature. House of Representatives. 78th Texas Legislature, Regular Session, House Bill 2156, Chapter 1095, legislative document, June 20, 2003; (https://texashistory.unt.edu/ark:/67531/metapth158386/m1/1/: accessed August 19, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .