Royen, P.C. van. “J.P. Sigmond, Nederlandse Zeehavens Tussen 1500 En 1800”. BMGN - Low Countries Historical Review 106, no. 1 (January 1, 1991): 94–96. Accessed November 25, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-103798.