Grossmann, J. B./Tierney, J. P. (1998): Does mentoring work? An impact study of the Big Brothers/Big Sisters. Evaluation Review, 22, pp. 403-426.
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Grossmann, J. B. T., P, J. (1998). Does mentoring work? An impact study of the Big Brothers/Big Sisters. Evaluation Review, 22 pp. 403-426.
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