https://www.socialeurope.eu/2017/07/49234/
https://theconversation.com/us-and-european-economies-depend-heavily-on-immigrants-decades-of-data-reveal-just-how-much-261508
https://migrationdataportal.org/blog/10-coolest-visualizations-migration-data?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=61078421
https://www.gov.uk/guidance/status-of-eu-nationals-in-the-uk-what-you-need-to-know