Cita APA

Hawking, S. (1993). Black Holes and Baby Universes and Other Essays. Bantam Books.

Citación estilo Chicago

Hawking, Stephen. Black Holes and Baby Universes and Other Essays. New York, N.Y.: Bantam Books, 1993.

Cita MLA

Hawking, Stephen. Black Holes and Baby Universes and Other Essays. Bantam Books, 1993.