
https://www.brookings.edu/wp-content/uploads/2016/07/Full-Report.pdf

https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef18005en.pdf

https://www.instituteforgovernment.org.uk/sites/default/files/publications/IFGJ5327_Report_Brexit_Civil_Service_080317_WEB.pdf