Identifiers
| WikiData URI | http://www.wikidata.org/entity/Q18603268 |
| Biografisch Portaal | http://www.biografischportaal.nl/persoon/06701051 |
| RKDartists | https://rkd.nl/explore/artists/45321 |
| Amsterdam Museum | http://hdl.handle.net/11259/people.29568 |
| VIAF | http://viaf.org/viaf/95835117 |
| Adamlink URI | https://adamlink.nl/person/koelman-johan-daniel/4395 |
