Columbia subject headings:
German language--Study and teaching--Foreign speakers.
German language--Study and teaching--Research.
Linguistic change--Germany--21st century.
Harvard subject headings:
German language--Study and teaching--Foreign speakers.
German language--Study and teaching--Research.
Linguistic change--Germany--21st century.
Princeton subject headings:
German language--Study and teaching--Foreign speakers.
German language--Study and teaching--Research.
Linguistic change--Germany--21st century.