APA
UN. Department of Economic and Social Development, . (1993). sex and age distribution of the world populations. New York: United Nations.
Chicago
UN. Department of Economic and Social Development, . 1993. sex and age distribution of the world populations. New York: United Nations.
Harvard
UN. Department of Economic and Social Development, . (1993). sex and age distribution of the world populations. New York: United Nations.
MLA
UN. Department of Economic and Social Development, . sex and age distribution of the world populations. New York: United Nations. 1993.