General Dynamics Corporation. Convair Division. General Dynamics News, Volume 20, Number 20, Wednesday, October 4, 1967, periodical, October 4, 1967; (https://texashistory.unt.edu/ark:/67531/metapth777401/m1/1/: accessed December 13, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .