General and Special Laws of The State of Texas Passed By The Regular Session and The First and Second Called Sessions of the Fifty-Seventh Legislature, legislative document, 1961; (https://texashistory.unt.edu/ark:/67531/metapth221760/m1/1/: accessed April 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .