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