1. Patterns of attachment behavior shown by the infant in interaction with his mother;Ainsworth;Merrill-Palmer Quarterly,1964
2. Attachment, exploration, and separation: Illustrated by the behavior of one-year-olds in a strange situation;Ainsworth;Child Development,1970
3. Interpersonal perception of young children: Ego-centrism or empathy?;Borke;Developmental Psychology,1971
4. The nature of the child's tie to his mother;Bowlby;International Journal of Psychoanalysis,1958