PFEIFFER J W. (1980). 1980 ANNUAL HANDBOOK FOR GROUP FACILITATORS. HUMAN REL. TRAINING.
Čikaški stil citiranja (17. izdanje)PFEIFFER J W. 1980 ANNUAL HANDBOOK FOR GROUP FACILITATORS. CALIFORNIA: HUMAN REL. TRAINING, 1980.
MLA način citiranja (9. izdanje)PFEIFFER J W. 1980 ANNUAL HANDBOOK FOR GROUP FACILITATORS. HUMAN REL. TRAINING, 1980.
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