Cita APA (7th ed.)
Allen,Charles L. (1987). God's seven wonders for you. Fleming H. Revell..
Cita Chicago (17th ed.)
Allen,Charles L. God's Seven Wonders for You. New York: Fleming H. Revell., 1987.
Cita MLA (9th ed.)
Allen,Charles L. God's Seven Wonders for You. Fleming H. Revell., 1987.
Atenció: Aquestes cites poden no estar 100% correctes.