John Bowlbi, Attachment (Basic books, New York, 1969); Separation: Anxiety and Anger (Basic books, New York, 1973).
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Lawrence Kohlberg, Stage and Sequence: The Cognitive-Descriptive Approach to Socialization, in D. A. Goslin, ed., Handbook of Socialization Theory and Research (Rand-McNally, Chicago, 111., 1969), pp. 347-480.
