Ritchie, D. (1981). The ring of fire. New American Library.
Cita Chicago (17th ed.)Ritchie, David. The Ring of Fire. New York: New American Library, 1981.
Cita MLA (9th ed.)Ritchie, David. The Ring of Fire. New American Library, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.