THE THEORY OF FLUID AND CRYSTALLIZED GENERAL INTELLIGENCE CHECKED AT THE 5–6 YEAR‐OLD LEVEL
- 1 June 1967
- journal article
- Published by Wiley in British Journal of Educational Psychology
- Vol. 37 (2), 209-224
- https://doi.org/10.1111/j.2044-8279.1967.tb01930.x