Sacchi, M. E. (1994). Stephen W. Hawking, A Brief History of Time. From the Big Bang to Black Holes. Introduction by Carl Sagan. New Edition. Bantam Books. New York-Toronto-London-Sydney- Auckland 1990. VIII + 198 páginas. ISBN 0-553-34614-8. Web
Citación estilo ChicagoSacchi, Mario Enrique. Stephen W. Hawking, A Brief History of Time. From the Big Bang to Black Holes. Introduction By Carl Sagan. New Edition. Bantam Books. New York-Toronto-London-Sydney- Auckland 1990. VIII + 198 Páginas. ISBN 0-553-34614-8. 1994.
Cita MLASacchi, Mario Enrique. Stephen W. Hawking, A Brief History of Time. From the Big Bang to Black Holes. Introduction By Carl Sagan. New Edition. Bantam Books. New York-Toronto-London-Sydney- Auckland 1990. VIII + 198 Páginas. ISBN 0-553-34614-8. 1994.