Columbia subject headings:
Harvard subject headings:
Grammar, Comparative and general--Aspect.
Grammar, Comparative and general--Tense.
Nakh languages--Aspect.
Nakh languages--Tense.
Princeton subject headings:
Grammar, Comparative and general--Aspect.
Grammar, Comparative and general--Tense.
Nakh languages--Aspect.
Nakh languages--Tense.