1. Attachment and Loss. Vol. I. Attachment;Bowlby;London, UK: Penguin Books,1969
2. Attachment and Loss. Vol. II. Separation: Anxiety and Anger;Bowlby;New York, NY: Basic Books,1973
3. Panic in children and adolescents: a review;Ollendick;J Child Psychol Psychiatry,1990
4. Diagnostic and Statistical Manual of Mental Disorders;American Psychiatric Association,1994
5. The ICD-10 Classification of Mental and Behavioural Disorders;World Health Organisation,1992