Pyle, O.P. The National Co-operator and Farm Journal (Dallas, Tex.), Vol. 28, No. 31, Ed. 1 Wednesday, May 8, 1907, newspaper, May 8, 1907; (https://texashistory.unt.edu/ark:/67531/metapth186289/m1/1/: accessed May 21, 2019), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .