| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Colour psychology: Home study course | 978-1-896249-26-1 (1-896249-26-4) | 1995 |
| Colour psychology: Home study course | 978-1-896249-28-5 (1-896249-28-0) | 1995 |
| Colour psychology: Home study course | 978-1-896249-30-8 (1-896249-30-2) | 1995 |