Basic survey on Japan's Gymnastics Report No.6 "The Actual States and The Future Prospects for Non-Student Gymnasts". Journal of Gymnastics Research. 2004. 12. 37-45
Basic survey on Japan is Gymnastics Report No.4 「The Actual state of the Gymnastics Athlete population and the Gymnastics Club Activities at the Junior High School」. Journal of Gymnastics Research. 2002. 10. 71-73