WALTER, U. On the heuristic value of medieval chancery products: with special reference to papal documents. Annali della Fondazione italiana per la storia amministrativa, [S. l.], v. 1, p. 117–134, 1964. Disponível em: https://heyjoe.fbk.eu/index.php/anfisa/article/view/833. Acesso em: 22 dic. 2024.