APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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