King, Sheppard W., III. [Letter from Sheppard W. King, III to John J. Herrera - 1977], letter, 1977; (https://texashistory.unt.edu/ark:/67531/metapth249792/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .