KEITH, Thomas. Heilige Gegenhelden − Hugo Balls „Byzantinisches Christentum“. Studia Germanica Gedanensia, [S. l.], n. 34, p. 132–146, 2016. Disponível em: https://czasopisma.bg.ug.edu.pl/index.php/SGG/article/view/1403. Acesso em: 19 grudz. 2024.