http://en.wikipedia.org/wiki/Demographics_of_the_United_States#Religious_affiliation

http://www.adherents.com/rel_USA.html

http://en.wikipedia.org/wiki/Sampling_%28statistics%29

http://www.collegian.psu.edu/archive/2006/03/03-16-06tdc/03-16-06dnews-03.asp

http://www.pct.edu/childcare/schedule.htm

http://www.psu.edu/ur/principles.pdf


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