E.W.A. Henssen, Uit de geschiedenis der Nederlandse geologische wetenschappen. BMGN - Low Countries Historical Review, [S. l.], v. 112, n. 1, p. 152–152, 1997. DOI: 10.18352/bmgn-lchr.4436. Disponível em: https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-105119.. Acesso em: 18 sep. 2024.