- Author: В. И. Ленин
- Language: Bulgarian
- Year: 1977
- Author: В. И. Ленин
- Language: Bulgarian
- Year: 1977
- Author: Карл Кауцки
- Language: Bulgarian
- Year: 1949
- Author: Никифор Горненски
- Language: Bulgarian
- Year: 1955
- Author: Георги Димитров
- Language: Bulgarian
- Year: 1982
- Author: Георги Димитров
- Language: Bulgarian
- Year: 1982
- Author: Георги Димитров
- Language: Bulgarian
- Year: 1983
- Author: Георги Димитров
- Language: Bulgarian
- Year: 1981
- Author: Карл Маркс Фридрих Енгелс
- Language: Bulgarian
- Year: 1985