Pfeiffer, J. W. (1989). The Encyclopedia of group activities: 150 practical designs for successful facilitating. University Associates.
Chicago-Zitierstil (17. Ausg.)Pfeiffer, J. William. The Encyclopedia of Group Activities: 150 Practical Designs for Successful Facilitating. San Diego, Calif.: University Associates, 1989.
MLA-Zitierstil (8. Ausg.)Pfeiffer, J. William. The Encyclopedia of Group Activities: 150 Practical Designs for Successful Facilitating. University Associates, 1989.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.