APA (7th ed.) Citation

Hawking, S., & Penrose, R. (1996). The nature of space and time. Princeton University Press.

Chicago Style (17th ed.) Citation

Hawking, Stephen, and Roger Penrose. The Nature of Space and Time. Princeton: Princeton University Press, 1996.

MLA (9th ed.) Citation

Hawking, Stephen, and Roger Penrose. The Nature of Space and Time. Princeton University Press, 1996.