1. Adams, R. (1942). Bull. N. Y. Acacd. Med., 18, /05.
2. Beringer, K., von Baeyer, W., and Marx, H. (1932). Ner enar7t, 5, 337.
3. Cattell, R. B. (1946). J. Pers, 14, 229, 239.
4. Douthwaite, A. H. (1947). Brit. med. J., 2. 43.
5. " Dimensions of Personality;Eysenck, H.J.,1947