Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (8a ed.)

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