ROËLL, D. C. In Memoriam Dr E. Heldring, 1871-1954 . The Rijksmuseum Bulletin, [S. l.], v. 2, n. 3, p. 66, 1954. DOI: 10.52476/trb.21536. Disponível em: https://bulletin.rijksmuseum.nl/article/view/21536.. Acesso em: 26 dec. 2024.