Frey, N. (2009). Productive group work: How to engage students, build teamwork, and promote understanding. Association for Supervision and Curriculum Development.
Chicago-Zitierstil (17. Ausg.)Frey, Nancy. Productive Group Work: How to Engage Students, Build Teamwork, and Promote Understanding. Alexandria, Va: Association for Supervision and Curriculum Development, 2009.
MLA-Zitierstil (9. Ausg.)Frey, Nancy. Productive Group Work: How to Engage Students, Build Teamwork, and Promote Understanding. Association for Supervision and Curriculum Development, 2009.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.