| title | ISBN-13 | year of publication |
|---|---|---|
| Connectors Getting Along | 978-1-4071-1226-8 | 2009 |
| Connectors Getting the Message | 978-1-4071-1227-5 | 2009 |
| Crossing the River X 6 Trade | 978-1-4071-2871-9 | 2011 |
| Dreaming of Treasure X6 Trade | 978-1-4071-2883-2 | 2011 |
| Melting Ice X6 Trade | 978-1-4071-2875-7 | 2011 |
| Night Wright Group Sunshine Level 1 | 978-0-7802-5217-2 | 1993 |
| Rimbling Giants X6 Trade | 978-1-4071-2877-1 | 2011 |