Cita APA (7th ed.)
Pohl, F., & Williamson, J. The Reefs of Space. Ballantine Books.
Cita Chicago (17th ed.)
Pohl, Frederick, i Jack Williamson. The Reefs of Space. Nueva York, EUA: Ballantine Books.
Cita MLA (9th ed.)
Pohl, Frederick, i Jack Williamson. The Reefs of Space. Ballantine Books.
Atenció: Aquestes cites poden no estar 100% correctes.