APA-viite (7. p.)
Barna, G. (1991). User friendly churches: What Christians need to know about the churches people love to go to. Regal Books.
Chicago-viite (17. p.)
Barna, George. User Friendly Churches: What Christians Need to Know About the Churches People Love to Go to. Ventura: Regal Books, 1991.
MLA-viite (9. p.)
Barna, George. User Friendly Churches: What Christians Need to Know About the Churches People Love to Go to. Regal Books, 1991.
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