https://bdi.eu/media/user_upload/20171005_Pressemitteilung_Brexit.pdf
https://www.opendemocracy.net/uk/robin-wilson/brexit-view-from-other-end-of-telescope?utm_source=Daily+Newsletter&utm_campaign=51652e55f2-DAILY_NEWSLETTER_MAILCHIMP&utm_medium=email&utm_term=0_717bc5d86d-51652e55f2-407405485
http://www.cer.eu/sites/default/files/bulletin_118_js-sl_article2.pdf
https://ukandeu.ac.uk/wp-content/uploads/2019/12/Brexit-the-manifestos-uncovered.pdf