1. World Health Organization http://www.who.int/reproductivehealth/publications/maternal_perinatal_health/9789241548502/en/
2. World Health Organization, UNICEF, UNFPA and The World Bank http://www.who.int/reproductivehealth/publications/monitoring/9789241503631/en
3. Postpartum haemorrhage in a teaching hospital in Nigeria: a 5-year experience;Ajenifuja;Afr Health Sci,2010
4. Factors contributing to maternal mortality in North-Central Nigeria: a seventeen-year review;Ujah;Afr J Reprod Health,2005
5. Postpartum hemorrhage: epidemiology, risk factors, and causes;Oyelese;Clin Obstet Gynaecol,2010