APA (7th ed.) Citation

Adams, D. (1980). The hitchhiker's guide to the galaxy. Harmony Books.

Chicago Style (17th ed.) Citation

Adams, Douglas. The Hitchhiker's Guide to the Galaxy. New York: Harmony Books, 1980.

MLA (9th ed.) Citation

Adams, Douglas. The Hitchhiker's Guide to the Galaxy. Harmony Books, 1980.