Bibliography
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Coffey, Justin P. (2014), "Harding Biographies",  in Sibley, Katherine A. S. (ed.), A Companion to Warren G. Harding, Calvin Coolidge, and Herbert Hoover, Chichester, UK: John Wiley & Sons, Inc., pp. 79–93, ISBN 978-1-4443-5003-6
Dary, David (2004). The Oregon Trail: An American Saga. New York: Alfred A. Knopf. ISBN 978-0-375-41399-5.
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Ferrell, Robert H. (1996). The Strange Deaths of President Harding (Kindle ed.). Columbia, MO: University of Missouri Press. ISBN 978-0-8262-1202-3.
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