
https://www.kcl.ac.uk/sspp/policy-institute/publications/What-sort-of-Brexit-do-the-British-people-want.pdf

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

https://ec.europa.eu/commission/publications/position-paper-transmitted-eu27-issues-relating-functioning-union-institutions-agencies-and-bodies_en