
https://www.socialeurope.eu/refugees-how-could-we-possibly-get-here

http://www2.warwick.ac.uk/fac/soc/pais/research/researchcentres/irs/crossingthemed/ctm_final_report_4may2017.pdf

https://www.opendemocracy.net/en/beyond-trafficking-and-slavery/exploitation-rule-not-exception/