Douglas Adams. (2002). Ultimate Hitchhiker's guide to the galaxy. Ballantine Books.
Chicago Style aipamenaDouglas Adams. Ultimate Hitchhiker's Guide to the Galaxy. New York: Ballantine Books, 2002.
MLA aipamenaDouglas Adams. Ultimate Hitchhiker's Guide to the Galaxy. Ballantine Books, 2002.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.