Academic Press · Various small imprints
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The Black Eagle: A study | 978-0-620-11915-3 (0-620-11915-2) | 1990 |
| The Black Eagle: A Study | 978-0-620-11916-0 (0-620-11916-0) | 1990 |
| The Black Eagle: A Study: Verreaux's Eagle in Southern Africa | 978-0-12-275970-3 (0-12-275970-2) | 1993 |