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3. Kant, I. (1964). The doctrine of virtue. Part II of the metaphysics of morals (Mary J. Gregor, trans.). Philadelphia: University of Pennsylvania Press.
4. NationalInstitute of the Family. (1994-1996). Study conducted by the Faculty of Medicine and the Faculty of Psychology of the Universidad Central, Ecuador; the National Institute of the Family, Ecuador; and the Institute of Migrations and Social Services of Spain.
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