1. Induction of labour at term-SOGC Clinical Practice Guideline;Crane;J Obstet Gynaecol Can,2001
2. Wing D Induction of labor: indications, techniques, and complications www.UpToDate.com
3. U.S. national trends in labor induction, 1989-1998;Zhang;J Reprod Med,2002
4. Rising rates of labor induction: present concerns and future strategies;Rayburn;Obstet Gynecol,2002
5. American College of Obstetricians and Gynecologists Induction of Labor. ACOG Practice Bulletin. Number 10 American College of Obstetricians and Gynecologists 1999