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Schwarz, R. (2000, February). Kellogg, John Harvey (1852-1943), physician, surgeon, and health reformer. American National Biography. Retrieved 5 Dec. 2019, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1200475.
Schwarz, Richard W. "Kellogg, John Harvey (1852-1943), physician, surgeon, and health reformer." American National Biography. February, 2000. Oxford University Press. Date of access 5 Dec. 2019, <https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1200475>
Schwarz, Richard W. "Kellogg, John Harvey (1852-1943), physician, surgeon, and health reformer." American National Biography. 1 Feb. 2000; Accessed 5 Dec. 2019. https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1200475.