| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Checkpoint English: Level 2 | 978-0-340-88738-7 (0-340-88738-9) | 2005 | Alan Howe · Sue Hackman |
| Checkpoint English: v. 1 | 978-0-340-88733-2 (0-340-88733-8) | 2005 | Alan Howe · Sue Hackman |
| Checkpoint English: v. 3 | 978-0-340-88739-4 (0-340-88739-7) | 2005 | Sue Hackman · Alan Howe |