P. V. · P. V. Bruyns · Peter B · V. B.
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Stapeliads of Southern Africa and Madagascar | 978-1-919766-37-9 (1-919766-37-5) | 2005 |
| Stapeliads of southern Africa and Madagascar | 978-1-919766-38-6 (1-919766-38-3) | 2005 |