- CBS - National Statistical Office Netherlands
- Data Archiving Networked Services (DANS)
- Eurostat
- IISD - International Institute Sustainable Devl.
- International Labour Migrations Statistics (ILO)
- ONS - Office National des Statistiques Algerie
- Slovak Demographic Research Centre - INFOSTAT
- Slovak Republik Statistical Office
- UNHCR - UN Refugee Agency
- World Bank Data