The Labor Signal. (Oklahoma City, Okla. Terr.), Vol. 3, No. 29, Ed. 1 Friday, May 1, 1903, newspaper, May 1, 1903; (https://gateway.okhistory.org/ark:/67531/metadc121623/m1/1/: accessed May 25, 2018), University of North Texas Libraries, The Gateway to Oklahoma History, gateway.okhistory.org; .