Hopper, B. (1987). Co-operative learning: An overview. University of Nottingham School of Education.
Chicago-Zitierstil (17. Ausg.)Hopper, Brenda. Co-operative Learning: An Overview. Nottingham: University of Nottingham School of Education, 1987.
MLA-Zitierstil (8. Ausg.)Hopper, Brenda. Co-operative Learning: An Overview. University of Nottingham School of Education, 1987.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.