Identifiers
| WikiData URI | http://www.wikidata.org/entity/Q534911 |
| Amsterdam Museum | http://hdl.handle.net/11259/people.84301 |
| VIAF | http://viaf.org/viaf/37189334 |
| Adamlink URI | https://adamlink.nl/person/billmark-carl-johan/8240 |
| WikiData URI | http://www.wikidata.org/entity/Q534911 |
| Amsterdam Museum | http://hdl.handle.net/11259/people.84301 |
| VIAF | http://viaf.org/viaf/37189334 |
| Adamlink URI | https://adamlink.nl/person/billmark-carl-johan/8240 |