APA (7th ed.) Citation

Unitted nations. (1991). Economic and social aspects of population ageing in Argenting. UN.

Chicago Style (17th ed.) Citation

Unitted nations. Economic and Social Aspects of Population Ageing in Argenting. New York: UN, 1991.

MLA (8th ed.) Citation

Unitted nations. Economic and Social Aspects of Population Ageing in Argenting. UN, 1991.

Warning: These citations may not always be 100% accurate.