APA
United Nations. Department of Economic and Social Affairs. Population Division, . (1998). World population monitoring 1997. New York: United Nations.
Chicago
United Nations. Department of Economic and Social Affairs. Population Division, . 1998. World population monitoring 1997. New York: United Nations.
Harvard
United Nations. Department of Economic and Social Affairs. Population Division, . (1998). World population monitoring 1997. New York: United Nations.
MLA
United Nations. Department of Economic and Social Affairs. Population Division, . World population monitoring 1997. New York: United Nations. 1998.