http://www.consilium.europa.eu/en/press/press-releases/2017/04/29-euco-brexit-guidelines/
https://www.opendemocracy.net/uk/looking-at-lexit/guy-aitchison/borders-open-borders-or-no-borders?utm_source=Daily+Newsletter&utm_campaign=0a51e05bcc-DAILY_NEWSLETTER_MAILCHIMP&utm_medium=email&utm_term=0_717bc5d86d-0a51e05bcc-407405485
http://www.cbi.org.uk/index.cfm/_api/render/file/?method=inline&fileID=4232B592-ACCC-40DB-9338BA0A97198435
https://openmigration.org/en/op-ed/how-immigrants-are-saving-the-italian-economy-and-pensions/