Callahan, K. L. (1990). Effective church leadership: Building on the twelve keys. Jossey-Bass.
Citazione stile Chigago Style (17a edizione)Callahan, Kennon L. Effective Church Leadership: Building on the Twelve Keys. San Francisco: Jossey-Bass, 1990.
Citatione MLA (9a ed.)Callahan, Kennon L. Effective Church Leadership: Building on the Twelve Keys. Jossey-Bass, 1990.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.