| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Opus: Audio CD-ROM 1 | 978-0-435-81210-2 (0-435-81210-6) | 2006 | |
| Opus: Student Book 1 | 978-0-435-81208-9 (0-435-81208-4) | 2006 | Mr Derek Hobbs |
| Opus: Teacher File & CD-ROM 1: Teacher's Resource File | 978-0-435-81211-9 (0-435-81211-4) | 2006 | |