World Health Organization. Reproductive Health and Research. (2002). Selected practice recommendations for contraceptive use. Reproductive Health and Research, Family and Community Health, World Health Organization.
Cita Chicago (17th ed.)World Health Organization. Reproductive Health and Research. Selected Practice Recommendations for Contraceptive Use. Geneva: Reproductive Health and Research, Family and Community Health, World Health Organization, 2002.
Cita MLA (9th ed.)World Health Organization. Reproductive Health and Research. Selected Practice Recommendations for Contraceptive Use. Reproductive Health and Research, Family and Community Health, World Health Organization, 2002.
Atenció: Aquestes cites poden no estar 100% correctes.