1. WHO Recommendations for the prevention and treatment of postpartum haemorrhage,2012
2. Trends in postpartum hemorrhage: United States, 1994–2006;Callahan;Am J Obstet Gynecol,2010
3. Intrapartum Care. Care of healthy women and their babies during childbirth,2007
4. Pregnancy, childbirth, postpartum and newborn care: a guide for essential practice,2006
5. Prolonged third stage of labor: morbidity and risk factors;Combs;Obstet Gynecol,1991