The Daily Panhandle (Amarillo, Tex.), Vol. 11, No. 215, Ed. 1 Wednesday, May 15, 1918, newspaper, May 15, 1918; (https://texashistory.unt.edu/ark:/67531/metapth319171/m1/1/: accessed November 18, 2019), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .