1. Anthony, E.J. (1974). A risk-vulnerability intervention model for children of psychotic parents. In E.J. Anthony & C. Koupernik (Eds.),The Child in his Family: Children at Psychiatric Risk (Vol. 3). New York: Wiley.
2. Bowlby, J. (1969).Attachment. London: Hogarth.
3. Bowlby, J. (1973).Separation. New York: Basic Books.
4. Bowlby, J. (1980).Loss. New York: Basic Books.
5. Calhoun, J.B. (1962). Population density and social pathology.Scientific American 206, p. 139.