| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Geographical information systems and their applicability to metropolitan regional authorities: The Western Cape Regional Services Council | 978-0-7972-0328-0 (0-7972-0328-1) | 1991 |
| Population census atlas of South Africa =: Bevolkingsensusatlas van Suid-Afrika | 978-0-7972-0069-2 (0-7972-0069-X) | 1986 |