Schulz, Heinrich. Oklahoma Volksblatt. (El Reno, Okla.), Vol. 16, No. 10, Ed. 1 Thursday, May 20, 1909, newspaper, May 20, 1909; (https://gateway.okhistory.org/ark:/67531/metadc942894/m1/1/: accessed December 8, 2019), University of North Texas Libraries, The Gateway to Oklahoma History, gateway.okhistory.org; .