APA (7th ed.) Citation

Hawking, S. W., & Penrose, R. (2010). The nature of space and time (13th print.). Princeton University Press.

Chicago Style (17th ed.) Citation

Hawking, S. W., and Roger Penrose. The Nature of Space and Time. 13th print. Princeton, N.J.: Princeton University Press, 2010.

MLA (9th ed.) Citation

Hawking, S. W., and Roger Penrose. The Nature of Space and Time. 13th print. Princeton University Press, 2010.