San Antonio Register (San Antonio, Tex.), Vol. 31, No. 8, Ed. 1 Friday, April 21, 1961, newspaper, April 21, 1961; (https://texashistory.unt.edu/ark:/67531/metapth399867/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .