The National Co-operator and Farm Journal (Dallas, Tex.), Vol. 28, No. 33, Ed. 1 Wednesday, May 22, 1907, newspaper, May 22, 1907; (https://texashistory.unt.edu/ark:/67531/metapth186291/m1/1/: accessed April 25, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .