APA (7th ed.) Zitazioa

Hawking, S., & Sagan, C. (1988). A brief history of time: From the big bang to black holes. Bantam Books.

Chicago Style (17th ed.) Zitazioa

Hawking, Stephen, eta Carl Sagan. A Brief History of Time: From the Big Bang to Black Holes. New York: Bantam Books, 1988.

MLA (9th ed.) Zitazioa

Hawking, Stephen, eta Carl Sagan. A Brief History of Time: From the Big Bang to Black Holes. Bantam Books, 1988.