
https://www.etuc.org/fr/presse/rien-quen-2017-chaque-travailleur-subi-une-perte-de-salaire-de-1764-€-en-raison-de-la#.WqrAWUxuI2x

https://www.ilo.org/legacy/english/inwork/cb-policy-guide/declarationofPhiladelphia1944.pdf

https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/623810/Wage_Growth_in_PRB_Occupations_-_final_report__3_.pdf