The Oklahoma Labor Unit (Oklahoma City, Okla.), Vol. 3, No. 4, Ed. 1 Saturday, July 1, 1911, newspaper, July 1, 1911; (https://gateway.okhistory.org/ark:/67531/metadc106999/m1/1/: accessed April 19, 2024), University of North Texas Libraries, The Gateway to Oklahoma History, gateway.okhistory.org; .