United Nations. Department for Economic and Social Information and Policy Analysis. Statistical Division. (1993). Demographic yearbook =: Annuaire demographique : population ageing and the situation of elderly persons. United Nations.
Παραπομπή σε μορφή Chicago (17η εκδ.)United Nations. Department for Economic and Social Information and Policy Analysis. Statistical Division. Demographic Yearbook =: Annuaire Demographique : Population Ageing and the Situation of Elderly Persons. New York: United Nations, 1993.
Παραπομπή σε μορφή MLA (9th εκδ.)United Nations. Department for Economic and Social Information and Policy Analysis. Statistical Division. Demographic Yearbook =: Annuaire Demographique : Population Ageing and the Situation of Elderly Persons. United Nations, 1993.
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