Texas. Secretary of State. Texas Register, Volume 5, Number 39, Pages 1991-2042, May 23, 1980, periodical, May 23, 1980; (https://texashistory.unt.edu/ark:/67531/metapth244670/m1/1/: accessed October 20, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .