SPENCINER, David B.; SPENCINER, Marina V. Numismatic letterforms of ‘A’ in medieval Europe: A classification system. KOINON: The International Journal of Classical Numismatic Studies, [S. l.], v. 2, p. 176–188, 2019. DOI: 10.32028/k.v2i.1151. Disponível em: https://www.archaeopresspublishing.com/ojs/index.php/koinon/article/view/1151. Acesso em: 28 dec. 2025.