Bielefeld, Wolfgang; Cleveland, William Suhs (2013 թ․ հունիսի 1). «Defining Faith-Based Organizations and Understanding Them Through Research». Nonprofit and Voluntary Sector Quarterly (անգլերեն). 42 (3): 442–467. doi:10.1177/0899764013484090. ISSN0899-7640.
Bielefeld, Wolfgang; Cleveland, William Suhs (2013 թ․ հունիսի 1). «Defining Faith-Based Organizations and Understanding Them Through Research». Nonprofit and Voluntary Sector Quarterly (անգլերեն). 42 (3): 442–467. doi:10.1177/0899764013484090. ISSN0899-7640.