Identifiers
| WikiData URI | http://www.wikidata.org/entity/Q41303485 |
| RKDartists | https://rkd.nl/explore/artists/45123 |
| Amsterdam Museum | http://hdl.handle.net/11259/people.29540 |
| Adamlink URI | https://adamlink.nl/person/knopperts-harry/4408 |
| WikiData URI | http://www.wikidata.org/entity/Q41303485 |
| RKDartists | https://rkd.nl/explore/artists/45123 |
| Amsterdam Museum | http://hdl.handle.net/11259/people.29540 |
| Adamlink URI | https://adamlink.nl/person/knopperts-harry/4408 |