Cita APA (7th ed.)

Adams, D. (2009). The Hitchhiker's guide to the galaxy. Pan Books.

Cita Chicago (17th ed.)

Adams, Douglas. The Hitchhiker's Guide to the Galaxy. London: Pan Books, 2009.

Cita MLA (8th ed.)

Adams, Douglas. The Hitchhiker's Guide to the Galaxy. Pan Books, 2009.