1. Mayer-Gross, W.; Slater, E., and Roth, M.: Clinical Psychiatry. Pp. 12–14. Cassel. London. 1954.
2. Bond, E.: A review of the five-year period following admission in 111 mental patients. Am. J. Insan., 77: 385–394, 1921.
3. Fuller, R.: Expectation of hospital life and outcome for mental patients on first admission.Psychiat. Quart., 4: 295–323, 1930.
4. Staudt, V., and Zubin, J.: A biometric evaluation of the somatotherapies in schizophrenia. Psychol. Bull., 54: 171–196, 1957.
5. Eysenck, H.: The effects of psychotherapy. In: Handbook of Abnormal Psychology. Pp. 697–725. Basic Books. New York. 1961.