George Vaillant, Triumphs of Experience: The Men of the Harvard Grant Study (Cambridge, MA: Belknap, 2012), 52.
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Harry F. Harlow, «The Nature of Love», American Psychologist 13, no. 12 (1958): 673–685; также цит. по George Vaillant, Triumphs of Experience: The Men of the Harvard Grant Study (Cambridge, MA: Belknap, 2012), 64.
