1. Conservatism in obstetrics;Cragin;NY J Med,1916
2. NIH Consensus Development Task Force statement on cesaraean childbirth. Am J Obstet Gynecol 1981; 139: 902-9.
3. Vaginal birth after previous caesarean delivery: clinical management guidelines for obstetrician-gynaecologists,1999
4. Public Health Service. Healthy People 2000: national health promotion and disease prevention objectives: full report with commentary. Washington, D.C.: government Printing Office, 1990: 378 (DHHS publication no (PHS) 91-50212.
5. Trends in caesarean birth and vaginal birth after previous caesarean 1991- 1999;Menacker;Natl Vital Stat Rep,2001