Guthrie, B. F. The Hereford Brand, Vol. 15, No. 16, Ed. 1 Friday, May 21, 1915, newspaper, May 21, 1915; (https://texashistory.unt.edu/ark:/67531/metapth253805/m1/1/: accessed April 25, 2019), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .