1. WHO, UNICEF, UNFPA, World Bank Group, and the United Nations Population Division. Trends in maternal mortality: 1990 to 2015: estimates by WHO, UNICEF, UNFPA, World Bank Group, and the United Nations Population Division. Geneva: World Health Organization, (2015).
2. United Nations. Sustainable Development Goals (SDGs): Goal 3: Ensure healthy lives and promote well-being for all at all ages. http://www.un.org/sustainabledevelopment/health/ (United Nations Statistics Division, New York, 2021).
3. World Health Organization, UNICEF. Trends in maternal mortality: 1990–2013: Estimates by WHO, UNICEF, UNFPA, the World Bank and the United Nations population division: Executive summary (2014).
4. Bale, J. R., Stoll, B. J. & Lucas, A. O. Improving Birth Outcomes: Meeting the Challenge in the Developing World (Institute of Medicine (US) Committee on Improving Birth Outcomes, National Academies Press, 2003).
5. WHO. Standards for Improving Quality of Maternal and Newborn Care in Health Facilities (WHO, 2016).