Texas. Legislature. General and Special Laws of The State of Texas Passed By The Second Called Session of the Sixty-Fifth Legislature and the Regular Session of the Sixty-Sixth Legislature, legislative document, 1979; (https://texashistory.unt.edu/ark:/67531/metapth221796/m1/1/: accessed December 11, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .