APA
United Nations D. o. E. a. S. A., . (1997). The Sex and age distribution of the world populations: The 1996 revision. New York: United Nations.
Chicago
United Nations Department of Economic and Social Affairs, . 1997. The Sex and age distribution of the world populations: The 1996 revision. New York: United Nations.
Harvard
United Nations D. o. E. a. S. A., . (1997). The Sex and age distribution of the world populations: The 1996 revision. New York: United Nations.
MLA
United Nations Department of Economic and Social Affairs, . The Sex and age distribution of the world populations: The 1996 revision. New York: United Nations. 1997.