Texas. Secretary of State. Texas Register, Volume 2, Number 14, Pages 645-682, February 18, 1977, periodical, February 18, 1977; (https://texashistory.unt.edu/ark:/67531/metapth252909/m1/1/: accessed September 18, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .