https://www.opendemocracy.net/en/beyond-trafficking-and-slavery/exploitation-rule-not-exception/
https://www.nao.org.uk/wp-content/uploads/2016/02/Managing-the-supply-of-NHS-clinical-staff-in-England.pdf
https://www.socialeurope.eu/romania-and-bulgaria-stuck-in-eus-second-tier
https://www.nnfe.eu/what-more-can-be-done-tackle-migration-crisis