[Photograph of The Firm Foundation], photograph, February 1973; (https://texashistory.unt.edu/ark:/67531/metapth596559/m1/1/: accessed May 10, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
[Photograph of The Firm Foundation], photograph, February 1973; (https://texashistory.unt.edu/ark:/67531/metapth596559/m1/1/: accessed May 10, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .