| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Tänze, Lieder, Stücke | 978-0-620-17180-9 (0-620-17180-4) | 1992 |
| The state and status of South Africa in the space-age; an answer and a contribution to contemporary thought: Die staat en status van Suid-Afrika in ... 'n bydrae tot die geestesstrominge in ons tyd | 978-0-620-01199-0 (0-620-01199-8) | 1973 |