O/U · Open Universiteit · Open University
| title | ISBN-13 | year of publication |
|---|---|---|
| Glossarium V4 | 978-0-13-332818-9 | 1989 |
| Glossarium V4 Phi/Ed | 978-0-13-355678-0 | 1989 |
| Inleid Plan Vermo V1 | 978-0-13-335654-0 | 1989 |
| Invest Vaste Activa V3 | 978-0-13-332800-4 | 1989 |
| Invest Vaste Activ V3 | 978-0-13-335662-5 | 1989 |