M. Cheyney, Olsen, C., Bovbjerg, M. L., Everson, C., Darragh, I., and Potter, B.,
“Practitioner and Practice Characteristics of Certified Professional Midwives in the United States: Results of the 2011 North American Registry of Midwives Survey.”,
Journal of midwifery & women's health, vol. 60, no. 5, pp. 534-45, 2015.