1. Archer, J., Pearson, N. A., and Westeman, K. E. (1988). Aggressive behaviour of children aged 6?11: Gender differences and their magnitude.Br. J. Soc. Psychol. 27: 371?384.
2. Baker, S. W., and Ehrhardt, A. A. (1974). Prenatal androgen, intelligence and cognitive sex differences. In Friedman, R. C., Richart, R. M., and Vande Wiele, R. L. (eds.),Sex Differences in Behavior Wiley, New York.
3. Bates, J. E., and Bentler, P. M. (1973). Play activities of normal and effeminate boys.Dev. Psychol. 9: 20?27.
4. Bates, J. E., Bentler, P. M., and Thompson, S. K. (1973). Measurement of deviant gender development in boys.Child Dev. 44: 591?598.
5. Beatty, W. W. (1984). Hormonal organization of sex differences in play fighting and spatial behaviour. In De Vries, G. J., De Bruin, J. P. C., Uylings, H. B. M., and Corner, M. A. (eds.),Progress in Brain Research, Vol. 61, Elsevier, Amsterdam, The Netherlands.