The Development of Abilities

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Jones L. V. “Factor Analysis of the Stanford-Binet at Four Age Levels”. Psychometrika, 1949, Vol. 14, No. 4.

Keats J. A. “Formal and Concrete Thought Processes”. Educational Testing Service Research Bulletin, 1955.

Piaget J. Psychology and Intelligence. New York: Harcourt, Brace and Company, Inc., 1950.

Piaget J. Logic and Psychology. Manchester: Manchester University Press, 1953.

Reichard S. “Mental Organization and Age Level”. Arch. of Psychol., 1944, Vol. 41, No. 295.

Richards S. “Genetic Emergence of Factor Specificity”. Psychometrika, 1941, Vol. 6, pp. 37–42.

Swineford F. “Growth in General and Verbal Bi-factors from Grades VII–X”. J. Educ. Psychol., 1947, Vol. 38, pp. 257–272.

Swineford F. “General Verbal and Spatial Bi-factors After Three Years”. J. Educ. Psychol., 1949, Vol. 40, pp. 353–360.

Swineford F. “The Nature of the General, Verbal and Spatial Bi-factors”. Supplementary Education Monographs, No. 67, November, 1948. Chicago: Chicago University Press.

Tomkins S. S. A Discussion of “Personality Structure and Personality Measurement” of R. B. Cattell in Proceedings of the 1951 Invitational Testing Conference. Princeton, Educational Testing Service, 1952.