Columbia subject headings:
German language--Social aspects--Congresses.
German language--Standardization--Congresses.
Language and languages--Research--Congresses.
Language awareness--Congresses.
Harvard subject headings:
German language--Social aspects--Congresses.
German language--Standardization--Congresses.
Princeton subject headings:
Language and languages--Research--Congresses.
Language awareness--Congresses.