The Hitchhiker's Guide to the Galaxy
Douglas Adams
Hitchhiker's Guide to the Galaxy (1)
The Restaurant at the End of the Universe
Hitchhiker's Guide to the Galaxy (2)
Life, the Universe and Everything
Hitchhiker's Guide to the Galaxy (3)
So Long, and Thanks for All the Fish
Hitchhiker's Guide to the Galaxy (4)
Young Zaphod Plays It Safe
Mostly Harmless
Hitchhiker's Guide to the Galaxy (5)
The Ultimate Hitchhiker's Guide to the Galaxy
Hitchhiker's Guide to the Galaxy (99)
And Another Thing ...
Eoin Colfer
Hitchhiker's Guide to the Galaxy (6)
Don't Panic: The Official Hitchhiker's Guide to the Galaxy Companion
Neil Gaiman
Don't Panic: Douglas Adams & The Hitchhiker's Guide to the Galaxy