Hooykaas, C., van der Velde, F. W., van der Linden, M. M., van Doornum, G. J., & Coutinho, R. A. (1991). The importance of ethnicity as a risk factor for STDs and sexual behaviour among heterosexuals.

Hooykaas, C., F W. van der Velde, M M. van der Linden, G J. van Doornum, και R A. Coutinho. The Importance of Ethnicity As a Risk Factor for STDs and Sexual Behaviour Among Heterosexuals. 1991.

Hooykaas, C., et al. The Importance of Ethnicity As a Risk Factor for STDs and Sexual Behaviour Among Heterosexuals. 1991.