William Urban, The Teutonic Knights. A Military History. Zeitschrift für Ostmitteleuropa-Forschung, [S. l.], v. 53, n. 3, p. 439–441, 2004. DOI: 10.25627/20045338269. Disponível em: https://openjournals.osmikon.de/zfo/article/view/8269. Acesso em: 16 sep. 2026.