1. Anxiety: definition, relationship to depression, and proposal for an integrative model;Akiskal,1985
2. Comorbidity of anxiety and depressive disorders: a helplessness–hopelessness perspective;Alloy,1990
3. Comorbidity;Angold;Journal of Child Psychology and Psychiatry,1999
4. Anxiety and its disorders: the nature and treatment of anxiety and panic;Barlow,1988
5. Mixed anxiety-depression and its implications for models of mood and anxiety disorders;Barlow;Comprehensive Psychiatry,2000