@article{Royen_1991, title={J.P. Sigmond, Nederlandse zeehavens tussen 1500 en 1800}, volume={106}, url={https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-103798}, DOI={10.18352/bmgn-lchr.3338}, number={1}, journal={BMGN - Low Countries Historical Review}, author={Royen, P.C. van}, year={1991}, month={Jan.}, pages={94–96} }