Baneke, D. “J.L.R. Touret, R.P.W. Visser, Dutch Pioneers of the Earth Sciences”. BMGN - Low Countries Historical Review 121, no. 2 (January 1, 2006): 340–341. Accessed November 21, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-107365.