Oklahoma Labor Unit (Oklahoma City, Okla.), Vol. 8, No. 9, Ed. 1 Saturday, August 21, 1915, newspaper, August 21, 1915; (https://gateway.okhistory.org/ark:/67531/metadc157265/m1/1/: accessed April 24, 2024), University of North Texas Libraries, The Gateway to Oklahoma History, gateway.okhistory.org; .