1. American College of Nurse-Midwives. Birthtools: What is physiologic birth? Retrieved from 〈http://birthtools.org/What-Is-Physiologic-Birth〉.
2. American College of Nurse-Midwives, 2012. , Midwives Alliance of North America, National Association of Certified Professional Midwives. Supporting consensus and normal physiologic birth: A consensus statement by ACNM, MANA, and NAPCM. Retrieved from 〈http://www.midwife.org/ACNM/files/ACNMLibraryData/UPLOADFILENAME/000000000272/Physiological%20Birth%20Consensus%20Statement-%20FINAL%20May%2018%202012%20FINAL.pdf〉.
3. Hormonal Physiology of Childbearing: evidence and Implications for Women, Babies, and Maternity Care;Buckley,2015
4. Effectiveness of a mindfulness-based childbirth education pilot study on maternal self-efficacy and fear of childbirth;Byrne;Journal of Midwifery and Women's Health,2014
5. Patterns of health insurance coverage around the time of pregnancy among women with live-born infants — pregnancy risk assessment monitoring system, 29 states, 2009;D’Angelo;Morbidity and Mortality Weekly Report,2015