APA-čujuhus (7. p.)

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

Chicago-čujuhus (17. p.)

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

MLA-čujuhus (9. p.)

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

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