1. Bock, R. D., and Kolakowski, D. (1973). Further evidence of sex-linked major-gene influence on human spatial visualizing ability.Am. J. Hum. Genet. 25:1?14.
2. French, J. W., Ekstrom, R. B., and Price, L. A. (1963).Manual for Kit of Reference Tests for Cognitive Factors, Educational Testing Service, Princeton, N.J.
3. Shepard, R. N., and Metzler, J. (1971). Mental rotation of three-dimensional objects.Science 171:701?703.
4. Stafford, R. E. (1961). Sex differences in spatial visualization as evidence of sex-linked inheritance.Percept. Motor Skills 13:428.
5. Thurstone, L. L., and Thurstone, T. G. (1965).Primary Mental Abilities, technical report, Science Research Associates, Chicago.