CreateSpace Independent Publishing Platform · Rainbow BV
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Deel 2 | 978-90-5831-555-7 (90-5831-555-X) | 2011 |
| the Calcudoku Series - February: 100 puzzles of great variety every month | 978-1-5232-3793-7 (1-5232-3793-7) | 2016 |