Nagaki Kosuke, Enndo Takuro, Sotokawa Shigenobu, Matsui Atsunori, Urata Kenji. A Study on Instruction for Beginners in Wind Surfing Class:Factors of Imcomplete Pre-Sailing. Journal of Sport and Physical Education Center, University of Tsukuba. 1986. 8. 35-44
Sotokawa Shigenobu, Honnma Takashi, Miyashita Ken, Kihara Motohiro, Urata Kenji. A Study on Instruction for Beginners Using Cross-country Ski Intensive Course of Regular Physical Education Class. Journal of Sport and Physical Education Center, University of Tsukuba. 1986. 8. 23-34