
http://www.migrationobservatory.ox.ac.uk/resources/reports/unsettled-status-which-eu-citizens-are-at-risk-of-failing-to-secure-their-rights-after-brexit/

https://ukandeu.ac.uk/trade-migration-and-brexit/

https://www.epp.eu/files/uploads/2017/04/11-EPP-Resolution-1-2.pdf