https://www.etui.org/sites/default/files/2021-12/01-ETU%20BM2021-Small.pdf
https://capx.co/immigration-means-low-wages-this-years-nobel-prize-winner-has-other-ideas/?utm_source=newsletter&utm_medium=email&utm_campaign=12%2F10%2F2021+
https://www.boeckler.de/pdf/p_wsi_report_39e_2018.pdf
http://www.ilo.org/wcmsp5/groups/public/—dgreports/—dcomm/—publ/documents/publication/wcms_490959.pdf