APA引文

(2001). Levels and trends of contraceptive use as assessed in 1998. United Nations.

Chicago Style (17th ed.) Citation

Levels and Trends of Contraceptive Use as Assessed in 1998. New York: United Nations, 2001.

MLA引文

Levels and Trends of Contraceptive Use as Assessed in 1998. United Nations, 2001.