1. Webster's Ninth New Collegiate Dictionary,1987
2. Palmer, D.D. Four unpublished letters to J.F. Alan Howard, during the period May 28 to December 17, 1906. Learning Resource Center Special Collection, The National College of Chiropractic, Lombard, IL
3. Howard, JFA. (Memoirs). The Philosophy of Chiropractic and Reminiscence of its Early Development and Growth, Maywood, IL, September 11, 1934 (unpublished manuscript). Special Collection, Learning Resource Center, The National College of Chiropractic, Lombard, IL
4. Howard, JFA. Encyclopedia of Chiropractic (The Howard System). Compiled, published and copyrighted by the National School of Chiropractic, Chicago, IL 1908-1910
5. the Making of a Profession The National College of Chiropractic 1906–1981;Beideman,1995