1. Practice Bulletin No. 160
2. Royal College of Obstetrics and Gynaecology.Preterm prelabour rupture of membranes (Green‐top guideline no. 44).2010.https://www.rcog.org.uk/globalassets/documents/guidelines/gtg_44.pdf. Accessed July 30 2015.
3. ACOG Practice Bulletin No. 107: Induction of Labor
4. Guidelines for cervical maturation and labor induction in late pregnancy;Obstetrics Group, Obstetrics and Gynecology Branch, Chinese Medical Association;Chin J Obstet Gynecol,2008
5. Guidelines for cervical maturation and labor induction in late pregnancy;Obstetrics Group, Obstetrics and Gynecology Branch, Chinese Medical Association;Chin J Obstet Gynecol,2014