Here you can find helpful links with regards to the European Union
European Commission: Employment, Social Affairs and Inclusion: https://ec.europa.eu/social/main.jsp?catId=471&langId=en
For various language, choose in the top bar.
European Foundation for the Improvement of Living and Working (Eurofound):
https://www.eurofound.europa.eu/observatories/eurwork/industrial-relations-dictionary/posted-workers
Euro Detachment:
http://www.eurodetachement-travail.eu/default.asp?rub=&lang=_en
The European Job Mobility Portal (EURES):
https://ec.europa.eu/eures/main.jsp?countryId=DK&acro=lw&lang=en&parentId=0&catId=0®ionIdForAdvisor=DK0®ionIdForSE=DK0®ionString=DK0%7CDK01
European Trade Union Confederation (ETUC):
https://www.etuc.org/en/posting-workers
FIEC (European Construction Industry Federation): The website provides information to construction companies and workers in relation to posting and covers the EU Countries.
http://www.posting-workers.eu/
EBC Construction SMEs Europe:
http://www.ebc-construction.eu/index.php?id=policyareas_postingofworkers
International Labour Organisation (ILO):
https://www.ilo.org/global/lang–en/index.htm
International Trade Union Confederation (ITUC):
https://www.recruitmentadvisor.org/
Employment, Social Affairs & Inclusion:
https://ec.europa.eu/social/main.jsp?catId=471
Working conditions Posted Workers:
https://europa.eu/youreurope/citizens/work/work-abroad/posted-workers/index_en.htm