1. Blough, D. S.: Technique for studying the effects of drugs on discrimination in the pigeon. Ann. N.Y. Acad. Sci. 65, 334?344 (1956).
2. Harris, T. H., and I. M. Cohen: Effects of chlordiazepoxide on psychoneurotic symptoms. Amer. Practit. 11, 999?1002 (1960).
3. Kamano, D. K., and D. J. Arp: Chlordiazepoxide (librium) consumption under stress conditions in rats. J. Neuropsychiat. (In press.)
4. Miller, N. E.: Learnable drives and rewards. In S. S. Stevens (Ed.), Handbook of experimental psychology, p. 435?472. New York: John Wiley & Sons 1951.
5. Mowrer, O. H.: Learning theory and personality dynamics. New York: Ronald Press 1950.