1. Trends in out-of-hospital births in the United States, 1990-2012;MacDorman;NHCS Data Brief,2014
2. Institute of Medicine of the National Academies http://iom.edu/Activities/Women/BirthSettings/2013-MAR-06.aspx 2015
3. Home Birth Consensus Summit http://www.homebirthsummit.org/best-practice-transfer-guidelines 2015
4. Homebirth Transfers in the United States: Narratives of Risk, Fear, and Mutual Accommodation;Cheyney;Qual Health Res,2014