Callahan, K. L. (1983). Twelve keys to an effective church: Strategic planning for mission. Harper & Row.
Tohutoru Kātū ChicagoCallahan, Kennon L. Twelve Keys to an Effective Church: Strategic Planning for Mission. Cambridge: Harper & Row, 1983.
Tohutoro MLACallahan, Kennon L. Twelve Keys to an Effective Church: Strategic Planning for Mission. Harper & Row, 1983.
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