Texas. Legislature. House of Representatives. 80th Texas Legislature, Regular Session, House Bill 1044, Chapter 844, legislative document, 2007-05/2007-06; (https://texashistory.unt.edu/ark:/67531/metapth154656/m1/1/: accessed November 17, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .