(2001). Levels and trends of contraceptive use as assessed in 1998. United Nations.
Chicago-referens (17:e uppl.)Levels and Trends of Contraceptive Use as Assessed in 1998. New York: United Nations, 2001.
MLA-referens (9:e uppl.)Levels and Trends of Contraceptive Use as Assessed in 1998. United Nations, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.