APA (7th ed.) Citation

Pohl, F. (1990). The world at the end of time. Ballantine Books.

Chicago Style (17th ed.) Citation

Pohl, Frederik. The World at the End of Time. New York: Ballantine Books, 1990.

MLA (9th ed.) Citation

Pohl, Frederik. The World at the End of Time. Ballantine Books, 1990.

Warning: These citations may not always be 100% accurate.