https://www.socialeurope.eu/2017/07/german-wages-need-rise/
https://www.tuc.org.uk/sites/default/files/Brexit%20Legal%20Opinion.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/623810/Wage_Growth_in_PRB_Occupations_-_final_report__3_.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/602309/58551_NHS_PRB_Accessible.pdf
http://www.geog.qmul.ac.uk/media/geography/docs/research/working-beyond-the-border/Governing-Labour-Standards.pdf
http://www.ips-journal.eu/topics/human-rights/article/show/lets-not-lose-our-thread-2155/
http://blog.arbeit-wirtschaft.at/mindestlohn-zufriedenere-beschaeftigte/
https://www.socialeurope.eu/2017/07/real-measure-inequality/
https://www.socialeurope.eu/2017/07/time-eu-fair-movement-directive/
https://www.brookings.edu/wp-content/uploads/2016/07/Full-Report.pdf