1. Guidelines for perinatal care (8th ed.),2017
2. American College of Obstetricians and Gynecologists & Society for Maternal-Fetal Medicine. (2014). Safe prevention of the primary cesarean delivery. Obstetric care consensus. Retrieved from http://www.acog.org/Resources-And-Publications/Obstetric-Care-Consensus-Series/Safe-Prevention-of-the-Primary-Cesarean-Delivery.
3. Guidelines for professional registered nurse staffing for perinatal units,2010
4. AWHONN position statement: Fetal heart monitoring;Journal of Obstetric, Gynecologic, & Neonatal Nursing,2015
5. A controlled trial of the differential effects of intrapartum fetal monitoring;Haverkamp;American Journal of Obstetrics & Gynecology,1979