Mikołaj Wiktor Gładysz, The Forgotten Crusaders. Poland and the Crusader Movement in the Twelfth and Thirteenth Centuries. Zeitschrift für Ostmitteleuropa-Forschung, Marburg, v. 63, n. 1, p. 109–112, 2014. DOI: 10.25627/20146319633. Disponível em: https://openjournals.osmikon.de/zfo/article/view/9633. Acesso em: 31 oct. 2026.