ENGELEN, D. H. Knap, Forschungsstelle Langeveld. Duits afluisterstation in bezet Nederland. BMGN - Low Countries Historical Review, [S. l.], v. 115, n. 2, p. 345–347, 2000. DOI: 10.18352/bmgn-lchr.5275. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-106056. Acesso em: 19 apr. 2024.