Columbia subject headings:
Harvard subject headings:
German language--Social aspects--Congresses.
German language--Social aspects--Europe, Central--Congresses.
Sociolinguistics--Congresses.
Sociolinguistics--Europe, Central--Congresses.
Princeton subject headings:
German language--Foreign countries--Congresses.
German language--Social aspects--Congresses.
Languages in contact--Europe, Central--Congresses.
Sociolinguistics--Congresses.
Sociolinguistics--Germany--Congresses.