Casler, Howard M. The Oklahoma Labor Unit (Oklahoma City, Okla.), Vol. 2, No. 51, Ed. 1 Saturday, June 3, 1911, newspaper, June 3, 1911; (https://gateway.okhistory.org/ark:/67531/metadc106991/m1/1/: accessed October 21, 2017), University of North Texas Libraries, The Gateway to Oklahoma History, gateway.okhistory.org; .