
http://www.britishchambers.org.uk/press-office/press-releases/bcc-firms-invest-in-local-labour-but-still-need-foreign-skills-to-plug-shortages.html

http://www.oxfordmartin.ox.ac.uk/downloads/academic/technology-globalisation-future-of-work_Mar2015.pdf

https://www.etuc.org/fr/presse/rien-quen-2017-chaque-travailleur-subi-une-perte-de-salaire-de-1764-€-en-raison-de-la#.WqrAWUxuI2x