APA
United Nations. Department of Economic and Social Affairs. Population Division, . (2000). Levels and trends of contraceptive use as assessed in 1998. New York: United Nations.
Chicago
United Nations. Department of Economic and Social Affairs. Population Division, . 2000. Levels and trends of contraceptive use as assessed in 1998. New York: United Nations.
Harvard
United Nations. Department of Economic and Social Affairs. Population Division, . (2000). Levels and trends of contraceptive use as assessed in 1998. New York: United Nations.
MLA
United Nations. Department of Economic and Social Affairs. Population Division, . Levels and trends of contraceptive use as assessed in 1998. New York: United Nations. 2000.