LEWIS, David Charles. The Return of Charlemagne: The Middle Ages, the European Idea, and the European Right. Florilegium, [S. l.], v. 15, p. 231–250, 1998. Disponível em: https://journals.lib.unb.ca/index.php/flor/article/view/14268. Acesso em: 19 apr. 2024.