The Pony Express (Carthage, Tex.), Vol. 22, No. 7, Ed. 1 Thursday, April 8, 1971, newspaper, April 8, 1971; (https://texashistory.unt.edu/ark:/67531/metapth507822/m1/1/: accessed May 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .