BOON, K. G. De etsen . The Rijksmuseum Bulletin, [S. l.], v. 9, n. 2-3, p. 90–113, 1961. DOI: 10.52476/trb.21373. Disponível em: https://bulletin.rijksmuseum.nl/article/view/21373.. Acesso em: 17 aug. 2025.