Hawking, S. W. (2001). universe in a nutshell. Bantam Press.
Chicago Style aipamenaHawking, Stephen W. Universe in a Nutshell. London: Bantam Press, 2001.
MLA aipamenaHawking, Stephen W. Universe in a Nutshell. Bantam Press, 2001.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.