Lockheed Martin Astronautics (Firm). Aeronautics Star, Volume 4, Number 3, May/June 2003, periodical, May 2003; (https://texashistory.unt.edu/ark:/67531/metapth1023868/m1/1/: accessed January 26, 2020), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .