An Approach toward Highly Motivated Classes : Using Mutual in Japanese Writing Classrooms. Memoirs of YUGE national college of Maritime Technology. 1998. 20
平仮名の創出と古今和歌集. 弓削商船高等専門学校. 1997. 19
Creation of Hiragana and Kokinwaka-shu. Memoirs of YUGE national college of Maritime technology. 1997. 19