1. Attachment and exploratory behavior of one-year-olds in a strange situation;Ainsworth,1969
2. Attachment and loss: Vol. 1. Attachment;Bowlby,1969
3. New perspectives on attachment relations: Security, communication, and internal working models;Bretherton,1987
4. Of human bonding: Newborns prefer their mother's voice;DeCasper;Science,1980
5. Ethology: The biology of behavior;Eibl-Eibesfeldt,1970