Cattell, R. B. "A Communication ." International Colloquium on Factor Analysis. Paris, 1955.
2.
El-Koussy, A. H. "Trends of Research in Space Abilities." International Colloquium on Factor Analysis. Paris, 1955.
3.
French, J. W. "The Description of Aptitude and Achievement Tests in Terms of Rotated Factors." Psychometric Monographs, No. 5, 1951.
4.
Guilford, J. P. "Dimensions of Intellect." International Colloquium on Factor Analysis . Paris, 1955.
5.
Guilford, J. P. "The Structure of Human Intellect ." (Paper presented to the National Academy of Sciences). Pasadena, California, November, 1955.
6.
Guttman, L.Two New Approaches to Factor Analysis . Report on Project Nonr-731 (00). Office of Naval Research, Washington, D. C., submitted jointly by International Public Opinion Research, Inc. and the Israel Institute of Applied Social Research, June, 1953.
7.
Guttman, L. "A New Approach to Factor Analysis: The Radex." In Lazarsfeld, P. F. (Editor), Mathematical Thinking in the Social Sciences. Glencoe, Illinois: The Free Press, 1954.
8.
Guttman, L. "An Outline of Some New Methodology for Social Research." Public Opinion Quarterly, XVIII (1954-55), 395-404.
9.
Guttman, L. "The Determinacy of Factor Score Matrices with Implications for Five Other Basic Problems of Common-Factor Theory." British Journal of Statistical Psychology , VIII (1955), 65-81.
10.
Guttman, L. "The Radex Approach to Factor Analysis." International Colloquium on Factor Analysis. Paris, 1955.
11.
Piaget, J. "Jean Piaget ." In A History of Psychology in Autobiography, IV . Worcester, Massachusetts: Clark University Press, 1952.
12.
Spearman, C.The Abilities of Man. New York: The Macmillan Company, 1927.
13.
Thurstone, L. L.The Nature of Intelligence. London: International Library of Psychology and Philosophy, 1924 .
14.
Thurstone, L. L.The Reliability and Validity of Tests. Ann Arbor, Michigan : Edwards Brothers, Inc., 1931.
15.
Thurstone, L. L.Vectors of Mind. Chicago: University of Chicago Press, 1936.
16.
16. Thurstone, L. L.Multiple-Factor Analysis . Chicago: University of Chicago Press, 1947.
17.
Thurstone, L. L. "Psychological Implications of Factor Analysis." American Psychologist, III (1948), 402-408
18.
; and inMarx, M. H.Psychological Theory. New York: The Macmillan Company, 1951.