Texas. Legislature. House of Representatives. 84th Texas Legislature, Regular Session, House Bill 3535, Chapter 976, legislative document, June 19, 2015; (https://texashistory.unt.edu/ark:/67531/metapth704639/m1/1/: accessed October 21, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .