- Author: Дон Дебелак
- Language: Bulgarian
- Year: 1997
- Author: Diana Stantcheva Klaus-Dieter Ludwig
- Language: German, Bulgarian
- Year: 2021
- Author: Павлина Върбанова
- Language: Bulgarian
- Year: 2020
- Author: Спас Мавров
- Language: Bulgarian
- Author: Боб Дейвис Лори Ренцел
- Language: Bulgarian
- Author: Антон Тодоров
- Language: Bulgarian
- Year: 2013
- Author: Gerhard Köbler
- Language: Bulgarian, German
- Year: 2006
- Author: Gerhard Köbler
- Language: German, Bulgarian
- Year: 2006
