https://www.dgb-bestellservice.de/besys_dgb/pdf/DGB15130.pdf
https://www.boeckler.de/pdf/p_study_hbs_376.pdf
https://www.oxfam.org/sites/www.oxfam.org/files/file_attachments/bp-reward-work-not-wealth-220118-en.pdf
https://www.brookings.edu/blog/future-development/2018/01/08/a-new-years-resolution-to-address-wage-inequality-in-firms/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=59882754
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1729en.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/662744/State_of_the_Nation_2017_-_Social_Mobility_in_Great_Britain.pdf
http://library.fes.de/pdf-files/dialog/13464.pdf
https://euagenda.eu/upload/publications/untitled-111339-ea.pdf
http://researchbriefings.files.parliament.uk/documents/CBP-7484/CBP-7484.pdf
https://www.socialeurope.eu/marrying-labour-flexibility-protection