1. History of maternal mortality study committees in the United States;Marmol;Obstet. Gynecol,1969
2. Maternal mortality—a 20 year study of Tulane Department of Obstetrics and Gynecology at Charity Hospital;Krupp;Obstet. Gynecol,1970
3. Gold, E.: Personal communication.
4. Williams' Obstetrics,1966