Identifiers
| WikiData URI | http://www.wikidata.org/entity/Q18508744 |
| RKDartists | https://rkd.nl/explore/artists/78768 |
| Amsterdam Museum | http://hdl.handle.net/11259/people.17152 |
| Rijksmuseum Amsterdam | urn:rijksmuseum:people:RM0001.PEOPLE.52785 |
| VIAF | http://viaf.org/viaf/19889186 |
| Adamlink URI | https://adamlink.nl/person/unger-william/8727 |
