APA (7th ed.) Citation

Penrose, R., & Gardner, M. (1991). The emperor's new mind: Concerning computers, minds and the laws of physics. Penguin Books.

Chicago Style (17th ed.) Citation

Penrose, Roger, and Martin Gardner. The Emperor's New Mind: Concerning Computers, Minds and the Laws of Physics. New York: Penguin Books, 1991.

MLA (8th ed.) Citation

Penrose, Roger, and Martin Gardner. The Emperor's New Mind: Concerning Computers, Minds and the Laws of Physics. Penguin Books, 1991.