UYTVEN, R. van. J. Goossens, De kwestie Lambertus ’li Beges’ (†1177). BMGN - Low Countries Historical Review, [S. l.], v. 100, n. 3, p. 472–473, 1985. DOI: 10.18352/bmgn-lchr.2631. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102856. Acesso em: 30 jan. 2023.