Cita APA (7a ed.)

Pohl, F. (1985). Beyond the blue event horizon (5. print.). Ballantine Books.

Cita Chicago Style (17a ed.)

Pohl, Frederik. Beyond the Blue Event Horizon. 5. print. New York: Ballantine Books, 1985.

Cita MLA (9a ed.)

Pohl, Frederik. Beyond the Blue Event Horizon. 5. print. Ballantine Books, 1985.