Inc, Active Interest Media (June 22, 1983). "Black Belt". Active Interest Media, Inc. Archived from the original on February 22, 2022. Retrieved February 22, 2022 – via Google Books. {{cite web}}: |last= has generic name (help)
Inc, Active Interest Media (June 22, 1983). "Black Belt". Active Interest Media, Inc. Archived from the original on February 22, 2022. Retrieved February 22, 2022 – via Google Books. {{cite web}}: |last= has generic name (help)
"USKO". Usko-karate.co.uk. Archived from the original on 24 March 2011. Retrieved 22 November 2014.