Biemond, Dirk Jan. “Acquisitions: The Marjan and Gerard Unger Collection Jewellery by Twentieth-Century Dutch Jewellers, Goldsmiths, Silversmiths and Designers”. The Rijksmuseum Bulletin 58, no. 3 (September 15, 2010): 266–303. Accessed May 19, 2024. https://bulletin.rijksmuseum.nl/article/view/11628.