Campbell, W. G. (Bill). Oral History Interview with W. G. (Bill) Campbell, April 21, 2000, text, April 21, 2000; (https://texashistory.unt.edu/ark:/67531/metapth1603378/m1/1/: accessed May 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .