Skurvydaitė, L. 2004. Insignia of the Lithuania’s rulers depicted on majesty seals during the end of the 13th and the middle of the 15th centuries: iconographical aspect of political programme. Lietuvos istorijos studijos. 14, (Dec. 2004), 18–30. DOI:https://doi.org/10.15388/LIS.2004.37140.