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In Cambridge Handbook of the Learning Sciences (2005)
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In How People Learn: Brain, Mind, Experience and School (2004), pp. 31-50.
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Journal of Asychronous Learning Networks, Vol. 2, No. 1. (March 1998), pp. 34-49.
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Child Development, Vol. 59, No. 1. (1988), pp. 87-96.
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