1. Cragin E. Conservatism in obstetrics. N Y Med J 1916;CIV:l–3.
2. Levine W. Thirty-year survey of cesarean section. Obstet Gynecol 1962;19:42–49.
3. Marieskind H. Cesarean section in the United States: has it changed since 1979? Birth 1989;16:196–201.
4. National Institute of Health: Consensus Development Conference on Cesarean Childbirth, September 1980, sponsored by the National Institute of Child Health and Human Development. Bethesda, maylands: NIH publication no. 82–2067,1981.
5. Taffel S, Placek P, Rosary C. U.S. Cesarean section rates 1990: an update. Birth 1992; 19:21–22.