Kerr, K. Austin (1967). «Decision For Federal Control: Wilson, McAdoo, and the Railroads, 1917». Journal of American History. 54 (3): 550–560. JSTOR2937406. doi:10.2307/2937406
Schlesinger Jr., Arthur M. (1997). "Rating the Presidents: From Washington to Clinton". Political Science Quarterly (1997). 112 (2): 179–190. doi:10.2307/2657937. JSTOR2657937.
Kerr, K. Austin (1967). «Decision For Federal Control: Wilson, McAdoo, and the Railroads, 1917». Journal of American History. 54 (3): 550–560. JSTOR2937406. doi:10.2307/2937406
Schlesinger Jr., Arthur M. (1997). "Rating the Presidents: From Washington to Clinton". Political Science Quarterly (1997). 112 (2): 179–190. doi:10.2307/2657937. JSTOR2657937.