1. Ainsworth, M. D. (1964). Patterns of attachment behavior shown by the infant in interaction with his mother. Merrill-Palmer Quarterly, 10(1), 51–58.
2. Ainsworth, M. D., Bell, S. M., & Stayton, D. J. (1972). Individual differences in the development of some attachment behaviors. Merrill-Palmer Quarterly, 18(2), 123–143.
3. Ainsworth, M. D. S., Blehar, M. C., Waters, E., & Wall, S. (1978). Patterns of attachment: A psychological study of the strange situation. Hillsdale, NJ: Erlbaum.
4. Bowlby, J. (1969/1982). Attachment and loss: Vol. 1. Attachment. New York: Basic.
5. Bretherton, I. (1995). A communication perspective on attachment relationships and internal working models. Monographs of the Society for Research in Child Development, 60(2–3, Serial No. 244).