(2005). Selected practice recommendations for contraceptive use (2nd ed.). World Health Organisation.
Chicago ZitierstilSelected Practice Recommendations for Contraceptive Use. 2nd ed. Geneva: World Health Organisation, 2005.
MLA ZitierstilSelected Practice Recommendations for Contraceptive Use. 2nd ed. World Health Organisation, 2005.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.