References and credits
- Dakin Burdick A history of Taekwondo copyright 1990
- Taekwondo, theorie en praktijk. Rien Thoutenhoofd 1987 Uitgeverij Elmar, ISBN 90-6120-549-2
- Kukkiwon Taekwondo Textbook 1995
- Taekwondo kyorugi. Kyong Myong Leed & Kook Hyun Jeong 1996
- Le taekwon do. Lee Kwan Young Sedirep cercle bushido 1971
- Fred Lufting (6th dan) and Roy Lufting (5th dan), Patrick Ros (3rd dan), Benno Wolthuis and Jeffrey Huber for guiding me towards my black belt.
- V.A.S. Arashi, my first club, many good memories.
- Frank Enneman for our collaborative training towards our blackbelt
- Kirsten Smith. Contribution of the description of Tuls
- John Brown and email@example.com. Contribution on the sine-wave and stepping motion, used in ITF Tuls
- Byung-Gyo Suh for his contribution to the description of the Korean Flag
- Jeong Mango, Kim Changjin, Koh Dong Joo and Park Wondae for their contribution to the language section.
- Steve Gombosi for his explanation on the origin of belt-colors.
- Oliver Field for correcting my english :-)