http://researchbriefings.files.parliament.uk/documents/CBP-7484/CBP-7484.pdf
http://www.oecd.org/fr/emploi/emp/Editorial-and-executive-summary-FR.pdf
https://ec.europa.eu/commission/priorities/deeper-and-fairer-economic-and-monetary-union/european-pillar-social-rights/european-pillar-social-rights-20-principles_en
https://www.dgb-bestellservice.de/besys_dgb/pdf/DGB15130.pdf