1. Ainsworth, M., Bell, S., & Stayton, D. (1971). Individual differences in strange situation behavior of one-year-olds. In H. Schafer (Ed.), The origins of human social relations (pp. 17–57). London: Academic Press.
2. Ainsworth, M. S., Blehar, M. C., Waters, E., & Wall, S. (1978). Patterns of attachment: A psychological study of the strange situation. Oxford, England: Lawrence Erlbaum.
3. American Academy of Child and Adolescent Psychiatry. (2005). Practice parameter for the assessment and treatment of children and adolescents with reactive attachment disorder of infancy and early childhood. Journal of the American Academy of Child and Adolescent Psychiatry, 44, 1206–1219.
4. American Psychiatric Association. (2000). Diagnostic and statistical manual of mental disorders (text revision). Washington, DC: Author.
5. Bischof, N. (1975). A systems approach toward the functional connections between fear and attachment. Child Development, 46(4), 801–817.