Hopper, B. (1987). Co-operative learning: An overview. University of Nottingham School of Education.
Citace podle Chicago (17th ed.)Hopper, Brenda. Co-operative Learning: An Overview. Nottingham: University of Nottingham School of Education, 1987.
Citace podle MLA (8th ed.)Hopper, Brenda. Co-operative Learning: An Overview. University of Nottingham School of Education, 1987.
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