1. Bock, R. D., and Kolakowski, D. (1973). Further evidence of sex-linked major-gene influences on human spatial ability.Am. J. Hum. Genet. 25:1?14.
2. DeFries, J. C., Ashton, G. C., Johnson, R. C., Kuse, A. R., McClearn, G. E., Mi, M. P., Rashad, M. N., Vandenberg, S. G., and Wilson, J. R. (1976). Parent-offspring resemblance for specific cognitive abilities in two ethnic groups.Nature 261:131?133.
3. French, J. W., Ekstrom, R. B., and Price, L. A. (1963).Kit of Reference Tests for Cognitive Factors, Educational Testing Service, Princeton, N.J.
4. Hartlage, L. C. (1970). Sex-linked inheritance of spatial ability.Percept. Motor Skills 31:610.
5. Johnson, R. C., DeFries, J. C., Wilson, J. R., McClearn, G. E., Vandenberg, S. G., Ashton, G. C., Mi, M. P., and Rashad, M. N. (1976). Assortative marriage for specific cognitive abilities in two ethnic groups.Hum. Biol. 48:343?352.