Cita APA (7a ed.)
Hawking, S. W. Black Holes and Baby Universes and Other Essays. Bantam Books.
Cita estilo Chicago (17a ed.)
Hawking, Stephen W. Black Holes and Baby Universes and Other Essays. Nueva York, EUA: Bantam Books.
Cita MLA (9a ed.)
Hawking, Stephen W. Black Holes and Baby Universes and Other Essays. Bantam Books.
Precaución: Estas citas no son 100% exactas.