Identifiers
| WikiData URI | http://www.wikidata.org/entity/Q770808 |
| Biografisch Portaal | http://www.biografischportaal.nl/persoon/09881518 |
| Amsterdam Museum | http://hdl.handle.net/11259/people.13405 |
| VIAF | http://viaf.org/viaf/53344923 |
| PPN | http://data.bibliotheken.nl/id/thes/p070834296 |
| Adamlink URI | https://adamlink.nl/person/polak-henri/9076 |
