Anonymous. (1867). The Tree of Life, or Human Degeneracy: Its Nature and Remedy as Based on the Elevating Principle of Orthopathy. Dental Cosmos 9: 224.

Anonymous. (1867). Orthopathy and Dr. J. Jennings. Buffalo Medical and Surgical Journal 7 (5): 193-194.

Barker C. The Founding of the New Haven County Medical Association. Yale J Biol Med. 1934 Jan;6(3):323-31. PMID: 21433600; PMCID: PMC2606507.

Burton, A., Burton, N, Krachler, B. (2018). Fasting Supervision and Lifestyle Care. Youngstown, OH. National Health Association.

Graham, S., Trall. R., Shelton, H. (2009) The Greatest Health Discovery. Youngstown, OH. National Health Association.

Hoff, H. “Isaac Jenning and the Magic Bullet.” Bulletin of the History of Medicine, vol. 35, no. 1, 1961, pp. 71–73. JSTOR, http://www.jstor.org/stable/44446766. Accessed 13 Dec. 2023. 

Lloyd, I. (2009). The History of Naturopathic Medicine: A Canadian Perspective. McArthur & Company. p. 386. ISBN 978-1552787786

Shelton, H. (1968). Natural Hygiene: The Pristine Way of Life Youngstown, OH. National Health Association. 

Wikipedia contributors. Isaac Jennings. Wikipedia, The Free Encyclopedia. March 14, 2023, 14:41 UTC. Available at: https://en.wikipedia.org/w/index.php?title=Isaac_Jennings&oldid=1144590791. Accessed December 20, 2023.