The Rijksmuseum | Documentation “A. Wallert, B. Schoonhoven, E. Metz, 'Becoming a Virtuoso Painter: Cornelis Ketel's Portrait of Adam Wachendorff and Homo Bulla', in: Making Art in Tudor Britain, Abstracts from Academic Workshops (2007-2008), internetpublicatie op: http://www.npg.org.uk/research/programmes/making-art-in-tudor-britain/workshops/workshop-3-abstract-11.php”