Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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