Columbia subject headings:
Avestan language--Ergative constructions.
Iranian languages, Middle--Ergative constructions.
Iranian languages--Ergative constructions.
Iranian languages--Grammar, Historical.
Iranian languages--Verb.
Old Persian language--Ergative constructions.
Harvard subject headings:
Iranian languages, Middle--Ergative constructions.
Iranian languages--Grammar, Historical.
Old Persian language--Ergative constructions.
Persian language--Grammar, Historical.
Princeton subject headings: