George Vaillant, Triumphs of Experience: The Men of the Harvard Grant Study (Cambridge, MA: Belknap, 2012), 112–113.
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См. также L. Alan Sroufe, «Attachment and Development: A Prospective, Longitudinal Study from Birth to Adulthood», Attachment and Human Development 7, no. 4 (2005): 349–367; L. Alan Sroufe et al., The Development of the Person: The Minnesota Study of Risk and Adaptation from Birth to Adulthood (New York: Guilford, 2005).