The Restaurant at the End of the Universe
Douglas Adams
The Hitchhiker's Guide to the Galaxy (2)
So Long, and Thanks for All the Fish
The Hitchhiker's Guide to the Galaxy (4)
Young Zaphod Plays It Safe
The Hitchhiker's Guide to the Galaxy (0.50)
Mostly Harmless
The Hitchhiker's Guide to the Galaxy (5)
And Another Thing...
Eoin Colfer
The Hitchhiker's Guide to the Galaxy (6)