APA (7th ed.) Zitazioa

Hawking, S. W. (1994). Black holes and baby universes: And other essays. Bantam.

Chicago Style (17th ed.) Zitazioa

Hawking, Stephen W. Black Holes and Baby Universes: And Other Essays. Nueva York: Bantam, 1994.

MLA (9th ed.) Zitazioa

Hawking, Stephen W. Black Holes and Baby Universes: And Other Essays. Bantam, 1994.