https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef18001en.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/602309/58551_NHS_PRB_Accessible.pdf
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1663en.pdf
http://www.geog.qmul.ac.uk/media/geography/docs/research/working-beyond-the-border/Governing-Labour-Standards.pdf