| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| On the Ball: Learning to Identify the Place Values of Ones and Tens | 978-0-8239-8859-4 (0-8239-8859-7) | 2008 |
| Signs on the Road: Learning to Identify the Four Basic Geometric Shapes | 978-0-8239-8857-0 (0-8239-8857-0) | 2008 |