Παραπομπή APA

Douglas Adams. (2002). Ultimate Hitchhiker's guide to the galaxy. Ballantine Books.

Παραπομπή Chicago Style

Douglas Adams. Ultimate Hitchhiker's Guide to the Galaxy. New York: Ballantine Books, 2002.

Παραπομπή MLA

Douglas Adams. Ultimate Hitchhiker's Guide to the Galaxy. Ballantine Books, 2002.