Hassan, R., & Benjamin, G. (1972). Ethnic outmarriage rates in Singapore: The influence of traditional socio-cultural organization. Dept. of Sociology, University of Singapore.

Hassan, Riaz, and Geoffrey Benjamin. Ethnic Outmarriage Rates in Singapore: The Influence of Traditional Socio-cultural Organization. Singapore: Dept. of Sociology, University of Singapore, 1972.

Hassan, Riaz, and Geoffrey Benjamin. Ethnic Outmarriage Rates in Singapore: The Influence of Traditional Socio-cultural Organization. Dept. of Sociology, University of Singapore, 1972.