HarperCollins · The Crowood Press Ltd
| title | media type | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|---|
| Pansies, Violas and Violettas: Complete Guide | Paperback | 978-1-85223-748-6 (1-85223-748-1) | 1992 |
| Pansies, Violas and Violettas: Complete Guide | Hardcover | 978-1-85223-332-7 (1-85223-332-X) | 1990 |
| Violas and Violettas | " | 978-0-00-412959-4 (0-00-412959-8) | 1994 |