1. Area Health Resource File (AHRF) 2014 VA: Health Resources and Services Administration, HRSA http://ahrf.hrsa.gov/overview.htm
2. Association of Religion Data Archives (ARDA) 1990 Churches and church membership in the United States, 1990 (counties file) http://www.thearda.com/Archive/CHCounty.asp
3. Association of Religion Data Archives (ARDA) 2000 Religious congregations and membership study, 2000 (counties file) http://thearda.com/Archive/Files/Descriptions/RCMSCY.asp
4. Association of Religion Data Archives (ARDA) 2010 Religious congregations and membership study, 2010 (counties file) http://thearda.com/Archive/Files/Descriptions/RCMSCY10.asp
5. Religion and infant mortality in the US: A preliminary study of denominational variations;Bartkowski;Religions,2011