United Nations International Symposium on Population and Development Planning Riga. (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.
Παραπομπή σε μορφή Chicago (17η εκδ.)United Nations International Symposium on Population and Development Planning Riga. 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.
Παραπομπή σε μορφή MLA (8th εκδ.)United Nations International Symposium on Population and Development Planning Riga. 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.
