Cita APA
Hawking, S. W., & Penrose, R. (2010). The nature of space and time (13th print.). Princeton University Press.
Citación estilo Chicago
Hawking, S. W., and Roger Penrose. The Nature of Space and Time. 13th print. Princeton, N.J.: Princeton University Press, 2010.
Cita MLA
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.