| title | ISBN-13 | year of publication |
|---|---|---|
| 425 Easy Chinese Characters | 978-0-9810576-2-0 | 2008 |
| 425 Intermediate Chinese Characters | 978-0-9810576-6-8 | 2008 |
| Hanzi and the Kangxi Radicals | 978-0-9810576-0-6 | 2008 |
| The First 251 Most Common Chinese Characters | 978-0-9810576-4-4 | 2008 |