WELS, C. De gouden delta, stoom en steenkool. De Rijnvaart 1815-1914. BMGN - Low Countries Historical Review, [S. l.], v. 91, n. 3, p. 489–494, 1976. DOI: 10.18352/bmgn-lchr.1955. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102117. Acesso em: 25 jan. 2022.