Clareson, Thomas D.; Athearn, Robert G. (1963). "Rebel of the Rockies: A History of the Denver and Rio Grande Western Railroad". American Quarterly. 15 (2): 221. doi:10.2307/2710884. JSTOR2710884.
Clareson, Thomas D.; Athearn, Robert G. (1963). "Rebel of the Rockies: A History of the Denver and Rio Grande Western Railroad". American Quarterly. 15 (2): 221. doi:10.2307/2710884. JSTOR2710884.