1. Attachment and Loss, Vol. 1;Bowlby,1969
2. Attachment and Loss, Vol. 2;Bowlby,1973
3. Attachment and Loss, Vol. 3;Bowlby,1980
4. A psychobiological theory of attachment;Kraemer;Behav Brain Sci,1992
5. Internal working models in attachment relationships;Bretherton,1999