Ruth Clifford Engs: The Progressive Era's Health Reform Movement: A Historical Dictionary. Greenwood Publishing Group, 2003. ISBN 9780275979324Teoksen verkkoversio Viitattu 16.5.2018. (englanniksi)
A. E. Samaan: From a Race of Masters to a Master Race: 1948 To 1848. A.E. Samaan, 8.2.2013. ISBN 9781626600003Teoksen verkkoversio Viitattu 16.5.2018. (englanniksi)
handle.net
hdl.handle.net
John Harvey Kellogg: Plain facts for old and young, or, The science of human life from infancy to old age :an illustrated cyclopedia of special knowledge for all classes on the hygiene of sex ... /, s. 294–364. Battle Creek, Mich. :, 1910, c1903.. Teoksen verkkoversio Viitattu 16.5.2018.