United Nations International Symposium on Population and Development Planning (1989 : Riga, Latvia), & United Nations. Department of International Economic and Social Affairs. (1993). Population and development planning: Proceedings of the United Nations International Symposium on Population and Development Planning : Riga, Latvian Soviet Socialist Republic, 4-8 December 1989. United Nations.
Cita Chicago (17th ed.)United Nations International Symposium on Population and Development Planning (1989 : Riga, Latvia), i United Nations. Department of International Economic and Social Affairs. Population and Development Planning: Proceedings of the United Nations International Symposium on Population and Development Planning : Riga, Latvian Soviet Socialist Republic, 4-8 December 1989. New York: United Nations, 1993.
Cita MLA (9th ed.)United Nations International Symposium on Population and Development Planning (1989 : Riga, Latvia), i United Nations. Department of International Economic and Social Affairs. Population and Development Planning: Proceedings of the United Nations International Symposium on Population and Development Planning : Riga, Latvian Soviet Socialist Republic, 4-8 December 1989. United Nations, 1993.