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3. Armstrong, R. S. Faith Witnesses: Leader’s Guide. Philadelphia, PA: The Geneva Press, 1987.
4. Bell, Antony L. “Increasing Discipleship Commitment and Assimilating People into the Life and Ministry of the Church Are Some of the Most Significant Areas in Need of Improvement .” Asbury Theological Seminary, 2007. https://place.asburyseminary.edu/cgi/viewcontent.cgi?article=1785&context=ecommonsatsdissertations.
5. Bivens, Forrest L. “The Doctrine of the Call and Ministry.” Essay Prepared for the Metropolitan South Pastoral Conference Southeastern Wisconsin District (WELS), , February 1, 1994. http://essays.wisluthsem.org:8080/bitstream/handle/123456789/519/BivensDoctrine.pdf?sequence=1&isAllowed=y.