| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The Unicorn: Myth and Reality | 978-0-442-80583-8 (0-442-80583-7) | 1977 |
| Unicorn: Myth and reality | 978-0-88405-583-9 (0-88405-583-3) | 1977 |
| Unicorn: Myth and Reality | 978-0-904069-15-0 (0-904069-15-X) | 1977 |
R. B · R. Beer · R.R. · Robert B. · Robert Beer · Rüdiger Robert Beer
Ash & Grant · Mason/Charter · Van Nostrand Reinhold