EKKART, R. E. O. Gerbrand Ban. The Rijksmuseum Bulletin, [S. l.], v. 39, n. 4, p. 426–434, 1991. DOI: 10.52476/trb.20604. Disponível em: https://bulletin.rijksmuseum.nl/article/view/20604.. Acesso em: 10 mar. 2025.