Columbia subject headings:
Harvard subject headings:
Armenian language--Aspect.
Armenian language--Modality.
German language--Aspect.
German language--Modality.
Russian language--Aspect.
Russian language--Modality.
Princeton subject headings:
Armenian language--Aspect.
Armenian language--Modality.
German language--Aspect.
German language--Modality.
Russian language--Aspect.
Russian language--Modality.