Texas Register, Volume 6, Number 21, Pages 955-1020, March 20, 1981, periodical, March 20, 1981; (https://texashistory.unt.edu/ark:/67531/metapth244410/m1/1/: accessed April 28, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .