GAWLIKOWSKI, Krzysztof. The Origins of the Name "Middle State". Czasopismo Prawno-Historyczne, [S. l.], v. 32, n. 1, p. 35–76, 1980. DOI: 10.14746/cph.1980.32.1.2. Disponível em: https://pressto.amu.edu.pl/index.php/cph/article/view/50309. Acesso em: 4 sie. 2026.