| title | ISBN-13 | year of publication |
|---|---|---|
| Hersentrainer - 80 Oefeningen / druk 1 - | 978-90-456-4633-6 | 2011 |
| Hersentrainer - 156 oefeningen / druk 1 - | 978-90-456-4597-1 | 2011 |
| Hersentrainer / druk 1 - | 978-90-456-4394-6 | 2011 |
| Hersentrainer / Rekenoefeningen / druk 1 - | 978-90-456-4611-4 | 2011 |