APA

(2002). World Population Ageing 19502050. New York: Department of Economic and Social Affairs Population Division, United Nations.

Chicago

2002. World Population Ageing 19502050. New York: Department of Economic and Social Affairs Population Division, United Nations.

Harvard

(2002). World Population Ageing 19502050. New York: Department of Economic and Social Affairs Population Division, United Nations.

MLA

World Population Ageing 19502050. New York: Department of Economic and Social Affairs Population Division, United Nations. 2002.