Oklahoma Labor Unit (Oklahoma City, Okla.), Vol. 5, No. 52, Ed. 1 Saturday, June 14, 1913, newspaper, June 14, 1913; (https://gateway.okhistory.org/ark:/67531/metadc157152/m1/2/: accessed April 23, 2024), University of North Texas Libraries, The Gateway to Oklahoma History, gateway.okhistory.org; .