RATAJCZAK, Krzysztof. Charlemagne – Emperor and Reformer. On the 1200th Death Anniversary. Biuletyn Historii Wychowania, [S. l.], n. 38, p. 309–318, 2018. DOI: 10.14746/bhw.2018.38.39. Disponível em: https://pressto.amu.edu.pl/index.php/bhw/article/view/20146. Acesso em: 16 kwi. 2024.