Texas. Legislature. House of Representatives. 84th Texas Legislature, Regular Session, House Bill 1666, Chapter 1039, legislative document, June 19, 2015; (https://texashistory.unt.edu/ark:/67531/metapth704416/m1/1/: accessed November 14, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .