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

https://ec.europa.eu/commission/sites/beta-political/files/revised_withdrawal_agreement_including_protocol_on_ireland_and_nothern_ireland.pdf

http://www.cer.org.uk/sites/default/files/insight_JS_9.5.17.pdf