Ryder, J. W. The Mangum Mirror (Mangum, Okla.), Vol. 1, No. 13, Ed. 1 Tuesday, May 1, 1917, newspaper, May 1, 1917; (https://gateway.okhistory.org/ark:/67531/metadc282035/m1/1/: accessed December 14, 2018), University of North Texas Libraries, The Gateway to Oklahoma History, gateway.okhistory.org; .