Creese, B. (1975). Australian opal. Mills & Boon.
Cita Chicago (17th ed.)Creese, Bethea. Australian Opal. London: Mills & Boon, 1975.
Cita MLA (8th ed.)Creese, Bethea. Australian Opal. Mills & Boon, 1975.
Atenció: Aquestes cites poden no estar 100% correctes.