Jones, Llyr, "Kodokan 10th Dan Promotions", Judo Info, retrieved December 5, 2011 Ohlenkamp, Neil, "Profiles of Kodokan 10th Dan Holders", Judo Info, retrieved December 5, 2011
Jones, Llyr, "Kodokan 10th Dan Promotions", Judo Info, hentet 5. december 2011.  Ohlenkamp, Neil, "Profiles of Kodokan 10th Dan Holders", Judo Info, hentet 5. december 2011.