Iizuka started judo training at Keio Gijuku in 1889, but broke off his training the following year to attend naval academy in Tokyo. Although the academy had no judo club, Iizuka saw a man carrying a judogi one day, and followed him to the Kodokan; he enrolled as a student there in November, 1891.
- Svinth, Joseph R. (2002). "Judo: Kunisaburo Iizuka". Journal of Combative Sport. Retrieved 28 May 2012.
- Rieko Kage (15 December 2010). Civic Engagement in Postwar Japan: The Revival of a Defeated Society. Cambridge University Press. pp. 129–. ISBN 978-0-521-19257-6. Retrieved 28 May 2012.
- "Kodokan Hall of Fame". Judo Channel. Retrieved 28 May 2012.