GERBENZON, P. H.A. Drielsma, Grondbezit en mutatierechten in het oude Friesland. BMGN - Low Countries Historical Review, [S. l.], v. 91, n. 1, p. 113–114, 1976. DOI: 10.18352/bmgn-lchr.1923. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102085.. Acesso em: 18 dec. 2024.