The Simmons Brand (Abilene, Tex.), Vol. 5, No. 33, Ed. 1, Saturday, May 21, 1921, newspaper, May 21, 1921; (https://texashistory.unt.edu/ark:/67531/metapth97793/m1/1/: accessed May 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .