Columbia subject headings:
Harvard subject headings:
Germany--Economic conditions.
Germany--Social conditions.
Helberger, Christof.
Labor market--Germany.
Labor supply--Germany.
Vocational education--Germany.
Princeton subject headings:
Germany--Economic conditions.
Germany--Social conditions.
Helberger, Christof.
Labor market--Germany.
Labor supply--Germany.
Vocational education--Germany.