| title | ISBN-13 | year of publication |
|---|
| Encyclopaedia of South African post offices and postal agencies | 978-0-620-09781-9 | 1986 |
| Encyclopaedia of South African post offices and postal agencies | 978-0-620-09782-6 | 1986 |
| Postmarks of South West Africa under South African administration: A comprehensive study, 1914-1977 | 978-0-620-02640-6 | 1977 |
| The comprehensive handbook of the postmarks of German South West Africa, South West Africa, Namibia | 978-0-620-15561-8 | 1991 |
| The Encyclopædia of South African Post Offices and Postal Agencies | 978-0-620-14784-2 | 1990 |
| The Encyclopædia of South African Post Offices and Postal Agencies | 978-0-620-14221-2 | 1989 |
| The postmarks of South Africa: Including postmarks of former South African states and colonies, also Basutoland, Bechuanaland, and Swaziland, ... postmarks, but excluding machine postmarks | 978-0-620-15823-7 | 1992 |
| The postmarks of South Africa: Including postmarks of former South African states and colonies, also Basutoland, Bechuanaland, and Swaziland, ... postmarks, but excluding machine postmarks | 978-0-620-15824-4 | 1992 |