1. Exercise during pregnancy and the postpartum period (ACOG Technical Bulletin, 189);American College of Obstetricians and Gynecologists,1994
2. Physical education and the pregnant woman: The way forward;Baddeley;Midwives Chronicle and Nursing Notes,1992
3. Rates of cesarean delivery—US, 1991;Centers for Disease Control and Prevention;Morbidity and Mortality Weekly Report,1994
4. The course of labor after endurance exercise during pregnancy;Clapp;American Journal of Obstetrics and Gynecology,1990
5. Childbearing beyond age 40: Pregnancy outcome in 24,032 cases;Gilbert;Obstetrics and Gynecology,1999