https://www.socialeurope.eu/deja-vu-home-office
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/741926/Final_EEA_report.PDF
http://institute.global/sites/default/files/field_article_attached_file/IGC_EU%20Migration_10.09.17.pdf
https://ukandeu.ac.uk/trade-migration-and-brexit/