Sandra Kidby
| Year | Publication | Title |
|---|---|---|
| 1999 | The Science of Discworld | The Science of Discworld |
| September 2001 | Discworld Thieves' Guild Yearbook and Diary 2002 | Discworld Thieves' Guild Yearbook and Diary 2002 |
| December 2015 | The Science of Discworld IV: Judgement Day | The Science of Discworld IV: Judgement Day |