1. Bott, E. A. (1925). The predictive value of college marks in medical subjects. J. Ed. Res. 12:214?227.
2. Cattell, R. B. (1949). ?Manual for Forms A and B: Sixteen Personality Factor Questionnaire.? Champaign, Illinois: Institute for Personality and Ability Testing.
3. Fricke, B. G. (1963). ?Opinion, Attitude and Interest Survey Handbook.? Ann Arbor, Michigan: Evaluations and Examinations Division, University of Michigan.
4. Gaier, E. L. (1952). The criterion problem in the prediction of medical school success. J. Appl. Psychol. 36:316?322.
5. Gough, H. G. (1957). ?Manual for the California Psychological Inventory.? Palo Alto, Calif.: Consulting Psychologists Press.