Caldwell, J. R., Schrader, D., Michael, W. B., and Meyers, C. E.Structure-of-intellect measures and other tests as predictors of success in tenth-grade modern geometry. EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, 1970, 30, 437-441.
2.
Guilford, J. P.The nature of human intelligence . New York: McGraw-Hill, 1967.
