KUIK, M. van. R.M. van Heeringen, P.A. Henderikx, A. Mars, Vroeg-middeleeuwse ringwalburgen in Zeeland. BMGN - Low Countries Historical Review, [S. l.], v. 112, n. 4, p. 536–538, 1997. DOI: 10.18352/bmgn-lchr.4577. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-105273. Acesso em: 5 may. 2024.