Columbia subject headings:
Old Turkic language--Texts--Dating.
Turkic languages--Grammar, Historical.
Turkic languages--Texts--Dating.
Harvard subject headings:
Asia, Central--Languages--History.
Turkish language--Dialects--Asia, Central.
Turkish language--To 1500.
Princeton subject headings:
Old Turkic language--Texts--Dating.
Turkic languages--Grammar, Historical.
Turkic languages--Texts--Dating.