1. Schuster RO: A history of orthopedics in podiatry. J Am Pod Assoc, 64:332, 1974.
2. Dorland’s Illustrated Medical Dictionary, 25th ed., W.B. Saunders, Philadelphia, 1974.
3. Kirby KA: Foot and Lower Extremity Biomechanics II: Precision Intricast Newsletters, 1997–2002. Precision Intricast, Inc., Payson, AZ, 2002.
4. Dagnall JC: History of foot supports. British J Chiropody, 32 (1):5–7, 1967.
5. Whitman R: Observations of forty-five cases of flat-foot with particular reference to etiology and treatment. Boston Med Surg J, 118:598, 1888.