https://www.baua.de/DE/Angebote/Publikationen/Berichte/F2398.pdf?__blob=publicationFile&v=3
http://www.ips-journal.eu/topics/human-rights/article/show/lets-not-lose-our-thread-2155/
https://knowledge.wharton.upenn.edu/article/will-jobs-return/?utm_source=kw_newsletter&utm_medium=email&utm_campaign=2020-04-07
https://www.socialeurope.eu/2017/06/trade-unions-and-the-decline-of-social-democracy/