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DeVries, R. (1997). Piaget's Social Theory. Educational Researcher, 26(2), 4–17.
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Perret-Clermont, A. N., & Schubauer-Leoni, M. L. (1981). Conflict and Cooperation as Opportunities for Learning. In W. P. Robinson (Ed.), Communication in Development (Vol. 203-234). New York: Academic Press.
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