Mills, William W.. Forty years at El Paso, 1858-1898; recollections of war, politics, adventure, events, narratives, sketches, etc., by W. W. Mills., Book, 1901; digital images, (http://texashistory.unt.edu/ark:/67531/metapth6112/ : accessed May 16, 2012), University of North Texas Libraries, The Portal to Texas History, http://texashistory.unt.edu; crediting UNT Libraries, Denton, Texas.
