| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Numicon: Number, Pattern and Calculating 3 Explore More Copymasters | 978-0-19-838974-3 (0-19-838974-4) | 2014 |
| Numicon: Number, Pattern and Calculating 4 Explore More Copymasters | 978-0-19-838988-0 (0-19-838988-4) | 2014 |