for Life", Self-Defense Publications, 1991, Peter Weckauf and Irmengard Hanzal: S.D.S.-CONCEPT Das Buch (inkl. Kubotan), 2009, in German Sammy Franco: "Kubotan Power", Contemporary Fighting Arts, 2014, Films Takayuki Kubota: The Authentic Kubotan Self-Defense Keychain, Unique Publications, Kubotan: The official Kubotan, Rising Sun Video Productions, ASIN B00011HJAW Georges Sylvain: The Persuader Kubotan & Yawara, Rising Sun Video Productions, ASIN B00065AXWE Peter Weckauf: SDS-Concept, BUDO International References External links Takayuki Kubota (auto)biography Kubotan official trademark (uspto.gov) The Koppo Stick by Don Rearic Pocket Sticks for Self-Defense by Phil Elmore Blunt weapons Non-lethal weapons Weapons of Japan