Jee, J. M. (unk.). Introduction to Hapkido. Pasadena, California: International Hapkido Association.

Koga, R. K. and Nelson, J. G. (1971). Police Weaponless Control. Beverly Hills, California: Glenco Press.

Smith, J. I. (1996). The Way of the Dragon, A Master’s Text.

Steele, D.E. (1975). Secrets of Modern Knife Fighting. Arvada, Colorado: Phoenix Press.

Healy Law Offices.  [Online]. Available: http://www.healylaw.com/armquote.htm