Clareson, Thomas D.; Athearn, Robert G. (1963). «Rebel of the Rockies: A History of the Denver and Rio Grande Western Railroad.». American Quarterly15 (2): 221. JSTOR2710884. doi:10.2307/2710884.
Clareson, Thomas D.; Athearn, Robert G. (1963). «Rebel of the Rockies: A History of the Denver and Rio Grande Western Railroad.». American Quarterly15 (2): 221. JSTOR2710884. doi:10.2307/2710884.