SCHAEPS, J. Cornelis Springer als topograaf. Bulletin KNOB, [S. l.], v. 90, n. 2, p. 53–58, 1991. DOI: 10.7480/knob.90.1991.2.535. Disponível em: https://bulletin.knob.nl/index.php/knob/article/view/Schaeps53. Acesso em: 4 mei. 2024.