Bonilla, William D. [Letter from William D. Bonilla to John J. Herrera - 1961-01-23], letter, January 23, 1961; (https://texashistory.unt.edu/ark:/67531/metapth250614/m1/2/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .