United Nations. Department of International Economic and Social Affairs, United Nations Fund for Population Activities, & United Nations/UNFPA Expert Group Meeting on Population and Development Modelling (1979 : Geneva, Switzerland). (1981). Population and development modelling: Proceedings of the United Nations. United Nations.
Cita Chicago (17th ed.)United Nations. Department of International Economic and Social Affairs, United Nations Fund for Population Activities, i Switzerland) United Nations/UNFPA Expert Group Meeting on Population and Development Modelling (1979 : Geneva. Population and Development Modelling: Proceedings of the United Nations. New York: United Nations, 1981.
Cita MLA (9th ed.)United Nations. Department of International Economic and Social Affairs, et al. Population and Development Modelling: Proceedings of the United Nations. United Nations, 1981.