72nd Texas Legislature, Regular Session, Senate Bill No. 134
72nd Texas Legislature, Regular Session, Senate Bill No. 134, legislative document, May 27, 1991; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth1261340/: accessed December 1, 2020), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting Private Collection of Mario Marcel Salas.