Hawking, S. W. (1988). A brief history of time. Bantam Books.
Cita Chicago (17th ed.)Hawking, S. W. A Brief History of Time. New York: Bantam Books, 1988.
Cita MLA (8th ed.)Hawking, S. W. A Brief History of Time. Bantam Books, 1988.
Atenció: Aquestes cites poden no estar 100% correctes.