| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Gateways to Air Travel: Primary Level Modules 1-10 | 978-1-900140-10-2 (1-900140-10-1) | 1995 |
| Gateways to Travel: Advanced Level Modules 1-8 | 978-1-900140-71-3 (1-900140-71-3) | 1997 |
| Gateways to Travel: Primary Level Modules 1-10 | 978-1-900140-00-3 (1-900140-00-4) | 1995 |