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