1. American Psychiatric Association (APA) (1980). Diagnostic and Statistical Manual of Mental Disorders (3rd ed.). (DSM-III). Washington, DC: APA.
2. Barsky, A. J. (1992). Amplification, somatization, and the somatoform disorders. Psychosomatics, 33, 28–34.
3. Beck, A. T., Rush, A. J., Shaw, B. F., & Emery, G. (1996). Kognitive Therapie der Depression [Cognitive therapy of depression].Weinheim: Beltz.
4. Beck, A. T., Hautzinger, M., Bailer, M., Worall H., & Keller F. (1995). Beck Depressions-Inventar. G*ttingen: Hogrefe.
5. Bradley, B., & Mathews, A. (1983). Negative self-schemata in clinical depression. British Journal of Clinical Psychology, 22, 173–181.