APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

Hawking, S. W., och Roger Penrose. The Nature of Space and Time. Princeton, N.J. : New York ; New Delhi: Princeton University Press, ; Oxford University Press, 1996.

MLA-referens (8:e uppl.)

Hawking, S. W., och Roger Penrose. The Nature of Space and Time. Princeton University Press, ; Oxford University Press, 1996.