1. Individual differences in Strange-Situation behavior of one-year-olds;Ainsworth,1971
2. Development of interpersonal smiling responses in the preschool years;Ames;Journal of Genetic Psychology,1949
3. Individual patterns of development;Bayley;Child Development,1956
4. The nature of the child's tie to his mother;Bowlby;International Journal of Psychoanalysis,1958
5. Attachment and loss (Vol. 2). Separation: Anxiety and anger;Bowlby,1973