Texas. Legislature. House of Representatives. 84th Texas Legislature, Regular Session, House Bill 48, Chapter 268, legislative document, June 1, 2015; (https://texashistory.unt.edu/ark:/67531/metapth704765/m1/1/: accessed June 24, 2019), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .