WERNER, Eduard. Teaching in the Absence of a Standard Language. A Case Study of Upper Sorbian. Slavia Occidentalis, [S. l.], n. 74/1, p. 157–167, 2017. DOI: 10.14746/so.2017.74.9. Disponível em: https://pressto.amu.edu.pl/index.php/so/article/view/13024. Acesso em: 23 sty. 2026.