1. Alexopoulous G S (1992) Geriatric depression reaches maturity (ed) Int J Geriatr Psychiatry 7: 305–306
2. Revised;American Psychiatric Association,1994
3. Asberg M, Montgomery S, Perris C, Schalling D, Sedvall C (1978) Psychiatric rating scale for depression. Acta Psychiatr Scand 271: 5–27
4. Baldwin B (1997) Depressive Erkrankungen. In: Forsti H (Hrsg) Lehrbuch der Gerontopsychiatrie, S 408–418
5. Beck AT (1978) Depression inventory. Philadelphia Center for Cognitive Therapy, Philadelphia PA