1. World Health Organization Postpartum care of the mother and the newborn: a practical guide. Safe mother hood unit WHO, Geneva 1998
2. Blood volume change in pregnancy and the puerperium; red blood cell loss and changes in apparent blood volume during and following vaginal delivery, cesarean section and cesarean section plus total hysterectomy;Pritchard;Am J Obstet Gynecol,1962
3. Emergency hysterectomy for obstetric hemorrhage;Clark;Obstet Gynecol,1984
4. Factors associated with postpartum hemorrhage with vaginal birth;Combs;Obstet Gynecol,1991
5. Factors associated with hemorrhage in cesarean deliveries;Combs;Obstet Gynecol,1991