Life, the Universe and Everything
Douglas Adams
So Long, and Thanks for All the Fish
The hitchhiker's guide to the galaxy
The Hitchhiker's Guide to the Galaxy (1)
The Restaurant at the end of the universe
The Hitchhiker's Guide to the Galaxy (2)
Mostly harmless
The Hitchhiker's Guide to the Galaxy (5)
Dirk Gently's Holistic Detective Agency
Dirk Gently (1)
The long dark tea-time of the soul
Dirk Gently (2)