KNOTTER, A. Ten geleide. Studies over de sociaaleconomische geschiedenis van Limburg, [S. l.], v. 43, p. VII-IX, 1998. DOI: 10.58484/ssegl.v43i12628. Disponível em: https://testplatform.openjournals.nl/SSEGL/article/view/12628. Acesso em: 12 apr. 2026.