Herrera, John Michael. [Letter from John M. Herrera to Mr. and Mrs. Khurker - 1966-03-22], letter, March 22, 1966; (https://texashistory.unt.edu/ark:/67531/metapth250836/m1/1/: accessed July 6, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .