References
- Alexander, W. P. , 1935. Intelligence, Concrete and Abstract , Brit. J. Psych. Monogr. Supp. (1935).
- Burt, C. , 1940. The Factors of the Mind . Univ. of London Press; 1940.
- Holzinger, K. J. , and Harman, H. H. , 1941. Factor Analysis . Univ. of Chicago Press; 1941.
- McNemar, Q. , 1942. On the Number of Factors , Psychometrika 7 (1942), pp. 9–18.
- Spearman, C. , 1927. The Abilities of Man . London: Macmillan; 1927.
- Thurstone, L. L. , 1947. Multiple-Factor Analysis . Univ. of Chicago Press; 1947.
- Wechsler, D. , 1941. The Measurement of Adult Intelligence, . Baltimore: Williams and Wilkins; 1941.