APA aipamena

PFEIFFER W. (1996). THE ENCY OF GROUP ACTIVITIES. PIEIFFER & CO.

Chicago Style aipamena

PFEIFFER W. THE ENCY OF GROUP ACTIVITIES. AMSTERDAN: PIEIFFER & CO, 1996.

MLA aipamena

PFEIFFER W. THE ENCY OF GROUP ACTIVITIES. PIEIFFER & CO, 1996.