Lawrence Kohlberg, Stage and Sequence: The Cognitive Developmental Approach to Socialization, in D. A. Goslin, ed., Handbook of Socialization Theory and Research (Rand-McNally Co., Chicago, 1969), pp. 347-380; см. также John C. Gibbs, Kohlberg's Stages of Moral Development: A Constructive Critique, Harvard Educational Review 47(1): 43-61 (1977).
