Columbia subject headings:
German language--Acquisition--Congresses.
German language--Study and teaching--Foreign speakers--Congresses.
Second language acquisition--Congresses.
Harvard subject headings:
German language--Acquisition--Congresses.
German language--Study and teaching--Foreign speakers--Congresses.
Second language acquisition--Congresses.
Princeton subject headings:
German language--Acquisition--Congresses.
German language--Study and teaching--Foreign speakers--Congresses.
Second language acquisition--Congresses.