American Psychiatric Association (1952). Mental Disorders: Diagnostic and Statistical Manual. Amer. Psychiat. Ass., Washington.
2.
KneutgenJ. (1966). Command of rhythm stronger than will to live. Impulse, Vol. 5, No. 22.
3.
PostF. (1965). The Clinical Psychiatry of Late Life. Pergamon Press, p. 63.
4.
RothM. (1955). The natural history of mental disorder in old age. J. ment. Sci., 101: 281–301.
5.
RothM. (1964). Prophylaxis and early diagnosis and treatment of mental illness of late life, in Current Achievements in Geriatrics, ed. AndersonW. F.IsaacsB. Castle, London.
