Texas. Legislature. Senate. Journal of the Senate of the State of Texas, First Called Session of the Seventy-Second Legislature, Volume 5, legislative document, 1991; (https://texashistory.unt.edu/ark:/67531/metapth146028/m1/1/: accessed July 21, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .