Columbia subject headings:
Harvard subject headings:
Quality of work life--Germany--History--20th century--Congresses.
Work environment--Political aspects--Germany--History--20th century--Congresses.
Work environment--Social aspects--Germany--History--20th century--Congresses.
Princeton subject headings:
Quality of work life--Germany--Congresses.
Work environment--Political aspects--Germany--Congresses.
Work environment--Social aspects--Germany--Congresses.