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4. Fletcher, D. (nd). Spiritual fitness & health assessment. Retrieved September 2, 2009 from http://www.faithandhealthconnection.org/the_connection/what-your-can-do/spiritual-exercises-spiritual-fitness-assessment/ .
5. Friedman, H. L., & MacDonald, D. A. (Eds.). (2002). Approaches to transpersonal measurement and assessment. San Francisco, CA: Transpersonal Institute.