[72nd Texas Legislature, Regular Session, Senate Bill, No. 134]
[72nd Texas Legislature, Regular Session, Senate Bill, No. 134], legislative document, January 14, 1991; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth1261192/: accessed December 4, 2020), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting Private Collection of Mario Marcel Salas.