Young Zaphod Plays It Safe
Douglas Adams
The Ultimate Hitchhiker's Guide - All Six Books
So Long, and Thanks for All the Fish
The Salmon of Doubt
The Restaurant at the end of the universe
Mostly harmless
The long dark tea-time of the soul
Life, the Universe and Everything
Last Chance to See
The hitchhiker's guide to the galaxy
HHGTTG - The Lost Chapters
Dirk Gently's Holistic Detective Agency