NIPPERDEY, J. van. Der Föderalismus in der deutschen Geschichte. BMGN - Low Countries Historical Review, [S. l.], v. 94, n. 3, p. 497–547, 1979. DOI: 10.18352/bmgn-lchr.2120. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102296.. Acesso em: 7 oct. 2024.