1. Howard, JFA. Encyclopedia of chiropractic (The Howard System). Three volumes, 665 pgs. Compiled, published and copyrighted by the National School of Chiropractic, Chicago, IL, ca. 1908-1910
2. The role of chiropractic in the early development of holistic healing. Lombard, IL: The National College of Chiropractic;Beideman;J Chiropr Humanities,1996
3. The sixteen major events in chiropractic;Wardwell;Chiropr History,1996
4. In: The making of a profession The National College of Chiropractic 1906-1981;Beideman,1995
5. The role of Howard's encyclopedic system in the professionalization of chiropractic;Beideman;Chiropr History,1996