The H-SU Brand (Abilene, Tex.), Vol. 56, No. 51, Ed. 1, Tuesday, April 20, 1971, newspaper, April 20, 1971; (https://texashistory.unt.edu/ark:/67531/metapth98793/m1/1/: accessed May 1, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .