RUTTEN, Willibrord. Ten geleide. Studies over de sociaaleconomische geschiedenis van Limburg, [S. l.], v. 54, p. 3–7, 2009. DOI: 10.58484/ssegl.v54i12486. Disponível em: https://testplatform.openjournals.nl/SSEGL/article/view/12486. Acesso em: 11 apr. 2026.