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; (https://texashistory.unt.edu/ark:/67531/metapth6112/m1/42/: accessed October 18, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .