KIJAS, Artur. The question of unity of Slavic people in the works of Joseph Perwolf. Balcanica Posnaniensia. Acta et studia, [S. l.], v. 16, p. 37–46, 2009. DOI: 10.14746/bp.2009.16.3. Disponível em: https://pressto.amu.edu.pl/index.php/bp/article/view/52436. Acesso em: 5 aug. 2026.