Cooper Review (Cooper, Tex.), Vol. 92, No. 13, Ed. 1 Thursday, April 1, 1971, newspaper, April 1, 1971; (https://texashistory.unt.edu/ark:/67531/metapth1541293/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .