San Antonio Register (San Antonio, Tex.), Vol. 31, No. 6, Ed. 1 Friday, April 7, 1961, newspaper, April 7, 1961; (https://texashistory.unt.edu/ark:/67531/metapth399248/m1/4/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .