https://www.ilo.org/legacy/english/inwork/cb-policy-guide/declarationofPhiladelphia1944.pdf
http://www.geog.qmul.ac.uk/media/geography/docs/research/working-beyond-the-border/Governing-Labour-Standards.pdf
http://www.acea.be/uploads/publications/ACEA_position_paper-Brexit.pdf
https://www.boeckler.de/pdf/p_imk_report_141e_2018.pdf