Callahan, K. L. (1990). Effective church leadership: Building on the twelve keys. Harper & Row.
Lua i Stíl Chicago (17ú heag.)Callahan, Kennon L. Effective Church Leadership: Building on the Twelve Keys. San Francisco: Harper & Row, 1990.
Lua MLA (8ú heag.)Callahan, Kennon L. Effective Church Leadership: Building on the Twelve Keys. Harper & Row, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.