JANSEN, H. J.A. Brongers, Air photography and celtic field research in the Netherlands, 2 dln. BMGN - Low Countries Historical Review, [S. l.], v. 96, n. 2, p. 355–356, 1981. DOI: 10.18352/bmgn-lchr.2248. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102427. Acesso em: 9 aug. 2022.