Oklahoma Labor Unit (Oklahoma City, Okla.), Vol. 5, No. 51, Ed. 1 Saturday, June 7, 1913, newspaper, June 7, 1913; (https://gateway.okhistory.org/ark:/67531/metadc157151/m1/1/: accessed April 19, 2024), University of North Texas Libraries, The Gateway to Oklahoma History, gateway.okhistory.org; .