1. American Baptist Churches U.S.A 2014 Summary of Baptist Churches U.S.A http://www.abc-usa.org/wp-content/uploads/2012/06/Summary-of-Denominational-Statistics-2012.pdf
2. Dearly departed: How often do congregations close;Anderson;Journal for the Scientific Study of Religion,2008
3. Association of Statisticians of American Religious Bodies 2012 U.S. Religion Census 2010: Summary findings http://www.rcms2010.org/images/ACP 20120501.pdf
4. Bagby , Ihsan 2012 The American mosque 2011 https://www.cair.com/images/pdf/The-American-Mosque-2011-part-1.pdf
5. The nones: Social characteristics of the religiously unaffiliated;Baker;Social Forces,2009