APA (7th ed.) Zitazioa
Barna, G. (1990). The frog in the kettle: What Christians need to know about life in the year 2000. Regal Books.
Chicago Style (17th ed.) Zitazioa
Barna, George. The Frog in the Kettle: What Christians Need to Know About Life in the Year 2000. Ventura, Calif., U.S.A.: Regal Books, 1990.
MLA (9th ed.) Zitazioa
Barna, George. The Frog in the Kettle: What Christians Need to Know About Life in the Year 2000. Regal Books, 1990.
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