O.F. · Otto Bishop of Freising · Otto F. · Professor Otto of Freising
Columbia University Press · W. W. Norton & Company
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Deeds of Frederick Barbarossa | 978-0-393-09697-2 (0-393-09697-1) | 1966 |
| The Deeds of Frederick Barbarossa | 978-0-231-13419-4 (0-231-13419-3) | 2004 |