Johnson, D. W., Johnson, R. T., & Holubec, E. J. (1994). The new circles of learning: Cooperation in the classroom and school. Association for Supervision and Curriculum Development.
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Chicago-čujuhus (17. p.)
Johnson, David W., Roger T. Johnson, juo Edythe Johnson Holubec. The New Circles of Learning: Cooperation in the Classroom and School. Alexandria, Va.: Association for Supervision and Curriculum Development, 1994.
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MLA-čujuhus (9. p.)
Johnson, David W., et al. The New Circles of Learning: Cooperation in the Classroom and School. Association for Supervision and Curriculum Development, 1994.
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