Cita APA (7a ed.)

Hawking, S., & Penrose, R. (2010). The Nature of Space and Time ([New ed.].). Princeton University Press.

Cita Chicago Style (17a ed.)

Hawking, Stephen, y Roger Penrose. The Nature of Space and Time. [New ed.]. Woodstock: Princeton University Press, 2010.

Cita MLA (8a ed.)

Hawking, Stephen, y Roger Penrose. The Nature of Space and Time. [New ed.]. Princeton University Press, 2010.