| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Bulgarskata Ideya Istoricheski Ochertsi | 978-O-937785-O2-7 (O-937785-O2-4) | 1985 | Stefan Popov |
Christer Oxenstierna · Christian Oecking · Christian Okonek · Christina Ossenkop · Christine Osinski