So Long, and Thanks for All the Fish
Douglas Adams
The Long Dark Tea-Time of the Soul
The Restaurant at the End of the Universe: Hitchhiker's Guide ...
Dirk Gently's Holistic Detective Agency
Mostly Harmless
Hitchhiker's Guide to the Galaxy (5)
Life, the Universe and Everything
Hitchhiker's Guide to the Galaxy (3)
The ultimate hitchhiker's guide to the galaxy
The Hitchhiker's Guide to the Galaxy