Dyfyniad APA

(2002). Selected recommendations for contraceptive use. World Health Organization.

Dyfyniad Arddull Chicago

Selected Recommendations for Contraceptive Use. Geneva: World Health Organization, 2002.

Dyfyniad MLA

Selected Recommendations for Contraceptive Use. World Health Organization, 2002.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.