Farmers' Champion (Elgin, Okla.), Vol. 5, No. 31, Ed. 1, Wednesday, May 12, 1915, newspaper, May 12, 1915; (https://gateway.okhistory.org/ark:/67531/metadc69608/m1/1/: accessed August 16, 2018), University of North Texas Libraries, The Gateway to Oklahoma History, gateway.okhistory.org; .