Fruchter, B."The Nature of Verbal Fluency."EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT , VIII (1948), 33-47.
2.
Garrett, Henry E."Differentiable Mental Traits."Psychological Record, II (1938), 259- 98.
3.
Guilford, J. P. (Ed.) Army Air Forces Aviation Psychology Program Research Reports. Printed classification tests, Report No. 5. Washington, D. C.: U. S. Government Printing Office, 1947.
4.
Guilford, J. P."Factor Analysis in a Test-Development Program."Psychological Review , V (1948), 79-94.
5.
Guilford, J. P. and Michael, W. B."Approaches to Univocal Factor Scores."Psychometrika, XIII (1948), I-22.
6.
Guilford, J. P. and Michael, W. B."Estimates of Factor Loadings when a Test is Homogeneously Changed in Length."Psychometrika , XV (1950), 237 -49.
7.
Guilford, J. P. and Zimmerman, W. S.The Guilford-Zimmerman Aptitude Survey. Beverly Hills, California: Sheridan Supply Company , 1947.
8.
Guilford, J. P. and Zimmerman, W. S."The Guilford-Zimmerman Aptitude Survey."Journal of Applied Psychology, XXXII (1948), 24- 34.
9.
Michael, W. B."Factor Analyses of Tests and Criteria. A Comparative Study of Two AAF Pilot Populations. Psychological Monographs : General and Applied, LXIII (1950), No. 3.
10.
Michael, W. B."The Nature of Space and Visualization Abilities: Some Recent Findings Based on Factor Analysis Studies."Transactions of the New York Academy of Sciences, Series II, Volume II (1949), 275 -81.
11.
Michael, W. B., Zimmerman, W. S., and Guilford, J. P."An Investigation of Two Hypotheses Regarding the Nature of the Spatial-Relations and Visualization Factors."EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, X (1950), 187-213.
12.
Swineford, Frances.A Study in Factor Analysis: the Nature of the General, Verbal, and Spatial Bi-Factors . Supplementary Educational Monographs, No. 67. Chicago : University of Chicago Press, 1948 .
13.
Thurstone, L. L.Multiple Factor Analysis. Chicago: University of Chicago Press, 1947.
14.
Thurstone, L. L.Primary Mental Abilities . Psychometric Monographs, No. i. Chicago: University of Chicago Press, 1938.
15.
Thurstone, L. L. and Thurstone, T. G.The Chicago Tests of Primary Mental Abilities: Manual of Instructions. Chicago: Science Research Associates, 1943.
16.
Thurstone, L. L. and Thurstone, T. G.Factorial Studies of Intelligence. Psychometric Monographs, No. 2. Chicago: University of Chicago Press, 1941.
17.
Zimmerman, W. S."A Simple Graphical Method for Orthogonal Rotation of Axes."Psychometrika , XI (1946), 51-55.
18.
Zimmerman, W. S."Isolation, Definition, and Measurement of Spatial-Visualization Abilities." Ph.D. thesis, University of Southern California, 1949 .