Columbia subject headings:
German language--Social aspects--Congresses.
Sociolinguistics--Congresses.
Youth--Language--Congresses.
Harvard subject headings:
German language--Social aspects--Congresses.
Sociolinguistics--Congresses.
Youth--Language--Congresses.
Princeton subject headings:
German language--Social aspects--Congresses.
Sociolinguistics--Congresses.
Youth--Language--Congresses.