Columbia subject headings:
German language--Dialects.
German language--History--21st century.
German language--Social aspects.
German language--Variation.
Harvard subject headings:
German language--Computer networks.
German language--Dialects.
German language--Social aspects.
German language--Spoken German.
German language--Technical German.
German language--Variation.
German philology.
Intercultural communication.
Princeton subject headings:
German language--Dialects.
German language--History--21st century.
German language--Social aspects.
German language--Variation.