Oklahoma State Labor News (Oklahoma City, Okla.), Vol. 1, No. 48, Ed. 2 Friday, March 29, 1907, newspaper, March 29, 1907; (https://gateway.okhistory.org/ark:/67531/metadc155074/m1/1/: accessed April 18, 2024), University of North Texas Libraries, The Gateway to Oklahoma History, gateway.okhistory.org; .