SARNECKI, Robert. An anniversary left untold. The 400th anniversary of the publishing of the Frankfurt Memorandum. Biuletyn Historii Wychowania, [S. l.], n. 38, p. 335–340, 2018. DOI: 10.14746/bhw.2018.38.42. Disponível em: https://pressto.amu.edu.pl/index.php/bhw/article/view/20141. Acesso em: 20 kwi. 2024.