https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1714en.pdf
http://uk.businessinsider.com/unemployment-in-the-uk-is-now-so-low-its-in-danger-of-exposing-the-lie-used-to-create-the-numbers-2017-7?r=US&IR=T
https://www.socialeurope.eu/employment-shifts-in-europe-during-the-recovery-three-little-noticed-trends
https://theconversation.com/the-gig-economy-is-nothing-new-it-was-standard-practice-in-the-18th-century-81057
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/