NORKUS, Zenonas. Was Grand Duchy of Lithuania a Federation?. Lietuvos istorijos studijos, [S. l.], v. 22, p. 9–38, 2024. DOI: 10.15388/LIS.2008.36970. Disponível em: https://test.zurnalai.vu.lt/lietuvos-istorijos-studijos/article/view/36970. Acesso em: 25 oct. 2025.