The National Co-operator and Texas Farm Journal. (Fort Worth, Tex.), Vol. 31, No. 38, Ed. 1 Wednesday, July 21, 1909, newspaper, July 21, 1909; (https://texashistory.unt.edu/ark:/67531/metapth1636891/m1/1/: accessed June 6, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .