A & C Black Publishers Ltd · Pica / Christopher Helm
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Owls | 978-1-873403-74-7 (1-873403-74-7) | 2000 | Klaus Konig · J.H. Becking |
| Owls of the World | 978-0-7136-6548-2 (0-7136-6548-3) | 2008 | Claus Konig |