Inc, Active Interest Media (1 September 1981). "Black Belt". Active Interest Media, Inc. Retrieved 13 February 2017 – via Google Books. {{cite web}}: |last= has generic name (help)
Thompson, Chris (1 January 2008). Black Belt Karate. New Holland Publishers. ISBN9781847730053. Retrieved 13 February 2017 – via Google Books.
Hicks, Terry Allan (1 January 2011). Karate. Marshall Cavendish. ISBN9780761449348. Retrieved 13 February 2017 – via Google Books.