GROENHUIS, G. J. Heringa, Geschiedenis van Drenthe. BMGN - Low Countries Historical Review, [S. l.], v. 102, n. 1, p. 64–65, 1987. DOI: 10.18352/bmgn-lchr.2783. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-103048. Acesso em: 27 apr. 2024.