PIHURA, Sonya. Jewels, Gems, and Magic Stones: The Uses of Stones in Natural Magic in the Middle Ages. Waterloo Historical Review, [S. l.], v. 8, 2016. DOI: 10.15353/whr.v8.73. Disponível em: https://openjournals.uwaterloo.ca/index.php/whr/article/view/73. Acesso em: 25 oct. 2026.