Adams Douglas. (1992). Hitch Hiker's guide to the galaxy: A trilogy in four parts. Pan Books Publisher.
Chicago Style (17th ed.) CitationAdams Douglas. Hitch Hiker's Guide to the Galaxy: A Trilogy in Four Parts. London: Pan Books Publisher, 1992.
MLA (9th ed.) CitationAdams Douglas. Hitch Hiker's Guide to the Galaxy: A Trilogy in Four Parts. Pan Books Publisher, 1992.
Warning: These citations may not always be 100% accurate.