Harkness, G. (1957). Understanding the christian faith. Abingdon-Cokebury.
Cita Chicago (17th ed.)Harkness, Georgia. Understanding the Christian Faith. New York: Abingdon-Cokebury, 1957.
Cita MLA (9th ed.)Harkness, Georgia. Understanding the Christian Faith. Abingdon-Cokebury, 1957.
Atenció: Aquestes cites poden no estar 100% correctes.