| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Wavelength Elementary Workbook with Key | 978-0-582-30549-6 (0-582-30549-7) | 1999 | |
| Wavelength Intermediate Course Book | 978-0-582-43870-5 (0-582-43870-5) | 2001 | Kathy Burke |
| Wavelength Pre-Intermediate Workbook With Key | 978-0-582-30547-2 (0-582-30547-0) | 2000 | |