APA (7th ed.) Citation

Adams Douglas. (2002). Ultimate Hitchhikers Guide to the Galaxy. Ballantine Books.

Chicago Style (17th ed.) Citation

Adams Douglas. Ultimate Hitchhikers Guide to the Galaxy. New York: Ballantine Books, 2002.

MLA (9th ed.) Citation

Adams Douglas. Ultimate Hitchhikers Guide to the Galaxy. Ballantine Books, 2002.

Warning: These citations may not always be 100% accurate.