http://economics.mit.edu/files/12979
https://www.ips-journal.eu/topics/democracy-and-society/german-companies-have-to-ensure-decent-working-conditions-5013/
https://esg.wharton.upenn.edu/zicklin-center/zicklin-bright-index/
https://www.etui.org/sites/default/files/2025-06/Benchmarking%20Working%20Europe%202025%20-%20WEB.pdf