1. World Health Organization. Trends in maternal mortality 2000 to 2017. estimates by WHO, UNICEF, UNFPA, World Bank Group and the United Nations Population Division. (2019). Accessed: October 7, 2023: https://www.un.org/development/desa/pd/sites/www.un.org.development.desa.pd/files/files/documents/2021/Dec/undesa_pd_....
2. Trends and causes of maternal mortality in Ethiopia during 1990-2013: findings from the Global Burden of Diseases study 2013;Tessema GA;BMC Public Health,2017
3. World Health Organization. Sexual and reproductive health. Maternal health in Nigeria. generating information for action. (2019). Accessed: November 7, 2023: https://www.who.int/reproductivehealth/maternal-health-nigeria/en/.
4. Reducing maternal mortality in Nigeria: addressing maternal health services’ perception and experience;Ope BW;J Glob Health Rep,2020
5. World Health Organization. Pregnancy, childbirth, postpartum and newborn care. a guide for essential practice. (2015). Accessed: October 17, 2023: https://www.who.int/publications/i/item/9789241549356.