Columbia subject headings:
Labor laws and legislation--Congresses.
Labor laws and legislation--European Union countries--Congresses.
Harvard subject headings:
Industrial relations--Congresses
Industrial relations--European Union countries--Congresses.
Industrial relations--Great Britain--Congresses.
Labor laws and legislation--Congresses
Labor laws and legislation--European Union countries--Congresses.
Labor laws and legislation--Great Britain--Congresses.
Princeton subject headings: