https://voxdev.org/topic/labour-markets-migration/let-their-people-come-migrants-drivers-knowledge-diffusion
http://www.ips-journal.eu/topics/human-rights/article/show/lets-not-lose-our-thread-2155/
http://www.britishchambers.org.uk/press-office/press-releases/bcc-firms-invest-in-local-labour-but-still-need-foreign-skills-to-plug-shortages.html