Cita APA (7th ed.)
Hawking, S. (1988). A brief history of time: Stephen Hawking. Bantam Books.
Cita Chicago (17th ed.)
Hawking, Stephen. A Brief History of Time: Stephen Hawking. New York: Bantam Books, 1988.
Cita MLA (9th ed.)
Hawking, Stephen. A Brief History of Time: Stephen Hawking. Bantam Books, 1988.
Atenció: Aquestes cites poden no estar 100% correctes.