Herrera, John J. [Letter from John J. Herrera to Carlos Villascas, page two - 1977-01-24], letter, January 24, 1977; (https://texashistory.unt.edu/ark:/67531/metapth251030/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .