The Crowood Press Ltd · Timber Press, Incorporated
| title | ISBN-13 | year of publication |
|---|---|---|
| The Rhododendron Guidebook | 978-1-86126-352-0 | 2001 |
| The Rhododendron Species: Azaleas | 978-0-88192-311-7 | 2003 |
| The Rhododendron Species: Elepidotes | 978-0-88192-109-0 | 2003 |
| The Rhododendron Species: Elepidotes Continued | 978-0-88192-168-7 | 2003 |
| The Rhododendron Species, Vol. 1: The Lepidotes | 978-0-917304-71-2 | 1982 |