BARTELS, Hauke. Massnahmen zur Dokumentation des Niedersorbischen. Slavia Occidentalis, [S. l.], n. 69, p. 7–22, 2012. DOI: 10.14746/so.2012.69.1. Disponível em: https://pressto.amu.edu.pl/index.php/so/article/view/6671. Acesso em: 6 grudz. 2025.