Cita APA (7th ed.)
Holt, V. (1993). The black opal. Doubleday.
Cita Chicago (17th ed.)
Holt, Victoria. The Black Opal. New York: Doubleday, 1993.
Cita MLA (9th ed.)
Holt, Victoria. The Black Opal. Doubleday, 1993.
Atenció: Aquestes cites poden no estar 100% correctes.