Columbia subject headings:
Harvard subject headings:
German language--Spoken German--Congresses.
Language and languages--Study and teaching--Congresses
Oral communication--Congresses
Oral communication--Study and teaching--Congresses.
Second language acquisition--Congresses
Princeton subject headings:
German language--Spoken German--Congresses.
Language and languages--Study and teaching--Congresses.
Oral communication--Congresses.
Oral communication--Study and teaching--Congresses.
Second language acquisition--Congresses.