1. Pew Research Center (Angelina E. Theodorou). 2015. Americans Are in the Middle of the Pack Globally When it Comes to Importance of Religion. www.pewresearch.org/fact-tank/2015/12/23/americans-are-in-the-middle-of-the-pack-globally-when-it-comes-to-importance-of-religion. (December 23, 2015) (accessed January 25, 2018).
2. Sacred and Secular