The Hopkins County Echo (Sulphur Springs, Tex.), Vol. 89, No. 9, Ed. 1 Friday, February 28, 1964, newspaper, February 28, 1964; (https://texashistory.unt.edu/ark:/67531/metapth823272/m1/10/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .