Coleman, J. C. (1989): The focal theory of adolescence: A psychological perspective. In: Hurrel- mann, K./Engel, U. (Hrsg.): The social world of adolescents. -Berlin, S. 43-56.
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Coleman, J.C. (1989): The Focal Theory of Adolescence: A Psychological Perspective. In: Hurrel- mann, K. & Engel, U. (Hg.): The Social World of Adolescents. International Perspectives, S. 43- 56. New York: de Gruyter.
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Coleman, J. C. (1989). The focal theory of adolescence: A psychological perspective. New York: de Gruyter. The Social World of Adolescents. International Perspectives, pp. 43-56.
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