World Health Organization Reproductive Health and Research & World health organization Family and Community Health. (2002). Selected practice recommendations for contraceptive use. Reproductive Health and Research, Family and Community Health World Health Organization.
Cytowanie według stylu Chicago (wyd. 17)World Health Organization Reproductive Health and Research i World health organization Family and Community Health. Selected Practice Recommendations for Contraceptive Use. Geneva: Reproductive Health and Research, Family and Community Health World Health Organization, 2002.
Cytowanie według stylu MLA (wyd. 8)World Health Organization Reproductive Health and Research i World health organization Family and Community Health. Selected Practice Recommendations for Contraceptive Use. Reproductive Health and Research, Family and Community Health World Health Organization, 2002.