Texas. Legislature. House of Representatives. 85th Texas Legislature, Regular Session, House Bill 967, Chapter 993, legislative document, June 15, 2017; (https://texashistory.unt.edu/ark:/67531/metapth1050762/m1/1/: accessed May 21, 2019), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .