PFEIFFER W. (1996). THE ENCY OF GROUP ACTIVITIES. PIEIFFER & CO.
Chicagoスタイル(17版)引用形式PFEIFFER W. THE ENCY OF GROUP ACTIVITIES. AMSTERDAN: PIEIFFER & CO, 1996.
MLA(9版)引用形式PFEIFFER W. THE ENCY OF GROUP ACTIVITIES. PIEIFFER & CO, 1996.
警告: この引用は必ずしも正確ではありません.