| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Echo 1 Pupil Book | 978-0-435-38868-3 | 2004 | Dr Steve Williams |
| Echo 2 Pupil Book | 978-0-435-38921-5 | 2005 | " |
| Echo 2 Teacher's Guide | 978-0-435-38922-2 | 2005 | Michael Wardle |
| Echo 3 Grun Pupil Book | 978-0-435-39111-9 | 2006 | Dr Steve Williams · Mr Michael Wardle |
| Echo 3 Grun Teacher's Guide | 978-0-435-39112-6 | 2006 | Steve Williams |
| Echo 3 Rot Pupil Book | 978-0-435-38981-9 | 2006 | Mr Michael Wardle |
| Echo Express 1: Teacher's Guide v.1: Teacher's Guide Vol 1 | 978-0-435-38898-0 | 2004 | Steve Williams |