| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Art, the challenge to integrate, using an investigative method: An art education study in five primary schools in Owamboland, Namibia 1991 | 978-91-7174-712-9 (91-7174-712-5) | 1992 | |
| Environment and Children: Passive Lessons from the Everyday Environment | 978-0-7506-8344-9 (0-7506-8344-9) | 2007 | Christopher Day |