The Oklahoma Labor Unit (Oklahoma City, Okla.), Vol. 2, No. 2, Ed. 1 Saturday, July 3, 1909, newspaper, July 3, 1909; (https://gateway.okhistory.org/ark:/67531/metadc106836/m1/1/: accessed April 26, 2019), University of North Texas Libraries, The Gateway to Oklahoma History, gateway.okhistory.org; .