Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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