1. Bloomberg, W.: End results of use of large doses of amphetamine sulfate over prolonged periods. New Engl. J. Mod. 222, 946–948 (1940).
2. Bradley, P. B., and J. Elkes: The effects of some drugs on the electrical activity of the brain. Brain 80, 77–117 (1957).
3. Connell, P. H.: Amphetamine psychosis. London: Chapman and Hall Ltd. 1958.
4. Edwards, A. L.: Statistical analysis for students in psychology and education. New York: Rhinehart and Co. 1946.
5. Haertzen, C. A., A. B. Wolbach jr., A. Wikler and H. E. Hill: Evaluating subjective effects of six drugs by means of an especially designed inventory. Paper delivered at Midwestern Psychological Association, Chicago 1961.