Wels, C.B. β€œDe Gouden Delta, Stoom En Steenkool. De Rijnvaart 1815-1914”. BMGN - Low Countries Historical Review 91, no. 3 (January 1, 1976): 489–494. Accessed January 19, 2022. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102117.