Theunissen, Bert. “Een Weinig Spectaculair Darwinjaar”. BMGN - Low Countries Historical Review 125, no. 4 (January 1, 2010): 48–58. Accessed June 29, 2022. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-108172.