Garrett, Henry E. "A Developmental Theory of Intelligence." American Psychologist, I (1946), 372-378.
2.
Levine, Abraham S. "Minnesota Psycho-Analogies Test." Journal of Applied Psychology, XXXIV (1950), 300-305.
3.
Thorndike, Robert L. and Hagen, Elizabeth. "Validation of the Electronics Technician Selection Test at Selected Class A Schools." U. S. Navy, Bureau of Naval Personnel, Technical Bulletin, 1955.