Miethke, Jürgen. “The Donatio Constantini in the Conflict Between the Pope and the Emperor in the 14th Century”. Patristica et Mediævalia 270 (June 5, 2006): 3-23. Accessed July 19, 2025. http://revistascientificas.filo.uba.ar/index.php/petm/article/view/7833.