| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Abacus Evolve (non-UK) Year 2: Solve the Problem Single-User Disk | 978-0-602-31410-1 (0-602-31410-0) | 2005 | Ruth Merttens · Mr Dave Kirkby |
| Abacus Mastery Checkpoints Workbook Year 3 / P4 | 978-1-292-27733-2 (1-292-27733-5) | 2018 | Ruth Merttens |
| Abacus Mastery Checkpoints Workbook Year 5 / P6 | 978-1-292-27735-6 (1-292-27735-1) | 2019 | Ruth Merttens · Jon Kurta |