Patrick T. Terenzini, Alberto F. Cabrera, Carol L. Colbeck, Stefani A. Bjorklund, John M. Parente, Racial and Ethnic Diversity in the Classroom: Does It Promote Student Learning?, The Journal of Higher Education, Vol. 72, No. 5 (Sep. - Oct., 2001), pp. 509-531
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Terenzini et al. (2001) studied this question.