Hilliard, Martha F. Oral History Interview with Martha F. Hilliard, February 28, 2002, text, February 28, 2002; (https://texashistory.unt.edu/ark:/67531/metapth1603965/m1/5/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .