
http://www.cbi.org.uk/index.cfm/_api/render/file/?method=inline&fileID=4232B592-ACCC-40DB-9338BA0A97198435

http://fedtrust.co.uk/views-from-the-federal-trust/free-movement-and-migration/

https://ec.europa.eu/commission/publications/position-paper-essential-principles-citizens-rights_en