| Life, the Universe and Everything (The Hitchhiker's Guide to the Galaxy, #3), by Douglas Adams | |
| The Restaurant at the End of the Universe (The Hitchhiker's Guide to the Galaxy, #2), by Douglas Adams | |
| So Long, and Thanks for All the Fish (Hitchhiker's Guide to the Galaxy, #4), by Douglas Adams | |
| Mostly Harmless (Hitchhiker's Guide to the Galaxy, #5), by Douglas Adams | |
| The Hitchhiker’s Guide to the Galaxy (Hitchhiker's Guide to the Galaxy, #1), by Douglas Adams | |
| The Hitchhiker's Guide to the Galaxy: A Trilogy in Four Parts, by Douglas Adams | |
| The “cup of tea” problem | |