
http://www.businessforscotland.com/survey-scottish-business-loses-trust-uk-governments-brexit-negotiations/

https://www.bertelsmann-stiftung.de/de/themen/aktuelle-meldungen/2019/maerz/brexit-kostet-deutschland-bis-zu-zehn-milliarden-euro-jaehrlich/

https://www.nao.org.uk/wp-content/uploads/2017/07/The-Customs-Declaration-Service.pdf