Convair Report to Supervision, Number 1026, August 9, 1978, periodical, 1978-06-30/1978-09-01; (https://texashistory.unt.edu/ark:/67531/metapth1149386/m1/1/: accessed June 27, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .