Mt. Vernon Optic-Herald (Mount Vernon, Tex.), Vol. 92, No. 36, Ed. 1 Thursday, June 1, 1967, newspaper, June 1, 1967; (https://texashistory.unt.edu/ark:/67531/metapth1277614/m1/1/: accessed July 4, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .