Beattie, George William (1925). "Development of Travel Between Southern Arizona and Los Angeles as It Related to the San Bernardino Valley". Annual Publication of the Historical Society of Southern California. 13 (2): 228–257. doi:10.2307/41168814. JSTOR41168814.
Beattie, George William (1925). "Development of Travel Between Southern Arizona and Los Angeles as It Related to the San Bernardino Valley". Annual Publication of the Historical Society of Southern California. 13 (2): 228–257. doi:10.2307/41168814. JSTOR41168814.