1. American Psychiatric Association. (1980). Diagnostic and statistical manual of mental disorders (3rd ed.). Washington, DC: American Psychiatric Association.
2. American Psychiatric Association. (1994). Diagnostic and statistical manual of mental disorders (4th ed.). Washington, DC: American Psychiatric Association.
3. Differentiating anxiety and depression: a test of the cognitive content specificity hypothesis;Beck;Journal of Abnormal Psychology,1987
4. Beck Anxiety Inventory;Beck,1990
5. Beck Depression Inventory-Second Edition;Beck,1996