J.L.R. Touret, R.P.W. Visser, Dutch pioneers of the earth sciences. BMGN - Low Countries Historical Review, [S. l.], v. 121, n. 2, p. 340–341, 2006. DOI: 10.18352/bmgn-lchr.6425. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-107365.. Acesso em: 30 jun. 2024.