RYČKOV, Andrej. Internal and External Structure of Ruthenian Letters in Early Modern Lithuania. Lietuvos istorijos studijos, [S. l.], v. 44, p. 31–46, 2019. DOI: 10.15388/LIS.2019.44.2. Disponível em: https://test.zurnalai.vu.lt/lietuvos-istorijos-studijos/article/view/15926. Acesso em: 27 oct. 2025.