(1997). The sisterhood method for estimating maternal mortality: Guidance notes for potential users. World Health Organization. Division of Reproductive Health (Technical Support), Family and Reproductive Health : United Nations Children's Fund.
Παραπομπή σε μορφή Chicago (17η εκδ.)The Sisterhood Method for Estimating Maternal Mortality: Guidance Notes for Potential Users. Geneva: World Health Organization. Division of Reproductive Health (Technical Support), Family and Reproductive Health : United Nations Children's Fund, 1997.
Παραπομπή σε μορφή MLA (8th εκδ.)The Sisterhood Method for Estimating Maternal Mortality: Guidance Notes for Potential Users. World Health Organization. Division of Reproductive Health (Technical Support), Family and Reproductive Health : United Nations Children's Fund, 1997.