1. Abbe, L. (1979), Levels of stimulation in the home environment and infant's behavior in the “strange-situation” at 12 months. Unpublished doctoral dissertation, University of Rochester.
2. Attachment and dependency;Ainsworth,1972
3. Patterns of Attachment;Ainsworth,1978
4. Continuity of individual adaptation from infancy to kindergarten;Arend;Child Develpm.,1979
5. Attachment and Loss;Bowlby,1969