https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef19034en.pdf
https://static1.squarespace.com/static/5adfc952ec4eb743393ebbbd/t/6075a1b4d148dc7bf6173c0f/1618321870456/ForesightGuide2021-JustLabs-Links_compressed+%2814MB%29.pdf
http://library.fes.de/pdf-files/iez/13375.pdf
https://www.researchgate.net/publication/351524462_HesaMag_23_-_with_a_special_report_about_workers_in_the_food_chain/link/609bfc9b458515a04c638ff6/download