Barna, G. (1992). The power of vision: How you can capture and apply God's vision for your ministry. regal books.
Lua i Stíl Chicago (17ú heag.)Barna, George. The Power of Vision: How You Can Capture and Apply God's Vision for Your Ministry. California: regal books, 1992.
Lua MLA (9ú heag.)Barna, George. The Power of Vision: How You Can Capture and Apply God's Vision for Your Ministry. regal books, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.