Herrera, John J. [Letter from John J. Herrera to Diaz Ordaz - 1965-03-27], letter, March 27, 1965; (https://texashistory.unt.edu/ark:/67531/metapth249155/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .