Raczyńska, S. “Ryszard Berwiński’s Studia O Literaturze Ludowej and Historiographical Concepts of the Early Slavic World in the Nineteenth Century”. Literatura Ludowa. Journal of Folklore and Popular Culture, vol. 64, no. 1, June 2020, pp. 17-28, doi:10.12775/LL.1.2020.002.