SKURVYDAITĖ, Loreta. Title of Lithuanian Ruler Vytautas: When did Vytautas Start to Title Himself as the Grand Duke?. Lietuvos istorijos studijos, [S. l.], v. 8, p. 9–19, 2000. DOI: 10.15388/LIS.2000.37245. Disponível em: https://test.zurnalai.vu.lt/lietuvos-istorijos-studijos/article/view/37245. Acesso em: 26 oct. 2025.