https://www.nytimes.com/2017/05/29/opinion/britain-brexit-economy.html?_r=1
http://fedtrust.co.uk/the-2017-general-election-a-mandate-for-brexit/
https://www.bertelsmann-stiftung.de/de/themen/aktuelle-meldungen/2019/maerz/brexit-kostet-deutschland-bis-zu-zehn-milliarden-euro-jaehrlich/
http://ukandeu.ac.uk/cancelling-brexit-what-would-happen-if-we-changed-our-mind-about-leaving-the-eu/