1. Bowlby J: Attachment and Loss, vol 1: Attachment. New York, Basic Books, 1969.
2. Bowlby J: Attachment and Loss, vol 2: Separation. Anxiety and Anger, New York, Basic Books, 1973.
3. Bowlby J: Attachment and loss, vol 3: Loss, Sadness and Depression, Attachment and Loss. London, Hogarth Press, 1980.
4. West M, Sheldon-Keller AE: Patterns of Relating: An Adult Attachment Perspective. New York, Guilford, 1994.