Oklahoma State Labor News (Oklahoma City, Okla.), Vol. 2, No. 47, Ed. 1 Friday, April 3, 1908, newspaper, April 3, 1908; (https://gateway.okhistory.org/ark:/67531/metadc155126/m1/1/: accessed April 19, 2024), University of North Texas Libraries, The Gateway to Oklahoma History, gateway.okhistory.org; .