International Sumo Federation
International Sumo Federation
European Sumo Union
US Sumo Federation
Belgium Sumo Federation
British Sumo Federation
Czech Sumo Union
German Sumo Federation
Netherlands Sumo Federation
Polish Sumo Federation

Professional Japanese Sumo
Nihon Sumo Kyokai (Japanese)
Nihon Sumo Kyokai (English)

Sumo Information
Sumo Fan Magazine
Wikipedia
Banzuke.com

Other
Martial Arts Info
Martial Arts Museum
Byamba's Official site