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Monsma (1996)
Monsma, S. V. 1996. When Sacred & Secular Mix: Religious Nonprofit Organizations and Public Money. Lanham, MA: Rowman & Littlefield. (Amazon)
Merino (2013)
Merino, S. M. 2013. “Religious Social Networks and Volunteering: Examining Recruitment via Close Ties.” Review of Religious Research, 55(3): 509-527. (Article)