标题:学習場面におけるインホーマル・グループの二・三の問題 : 13.学級構造 [in Japanese] Some problems of informal groups in the learning situation. : LIST OF PAPERS PRESENTED AT THE THIRD ANNUAL CONVENTION OF THE JAPANESE ASSOCIATION OF EDUCATIONAL PSYCHOLOGY October 17-21,1961,Nagoya : Division 6 : Structure of Classroom [in Japanese]