Doel, M., & Sawdon, C. (1999). The essential groupworker: Teaching and learning creative groupwork. Jessica Kingsley Publishers.
Citace podle Chicago (17th ed.)Doel, Mark, a Catherine Sawdon. The Essential Groupworker: Teaching and Learning Creative Groupwork. London: Jessica Kingsley Publishers, 1999.
Citace podle MLA (9th ed.)Doel, Mark, a Catherine Sawdon. The Essential Groupworker: Teaching and Learning Creative Groupwork. Jessica Kingsley Publishers, 1999.
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