1. American Psychiatric Association. (2000). Diagnostic and statistical manual of mental disorders (Revised 4th ed.). Washington, DC.
2. Beck, A. T. (1976). Cognitive therapy and the emotional disorders. New York: International Universities Press.
3. Beck, A. T., & Clark, D. A. (1988). Anxiety and depression: An information processing perspective. Anxiety Research, 1, 23–36.
4. Beck, A. T., & Steer, R. A. (1993). Beck anxiety inventory manual. San Antonio, TX: Psychological Corporation.
5. Beck, A. T., Steer, R. A., & Brown, G. K. (1996). Beck Depression Inventory manual (2nd ed.). San Antonio, TX: Psychological Corporation.