Columbia subject headings:
Caucasian languages--Lexicology.
Caucasian languages--Morphology.
Caucasian languages--Phonology, Historical.
Harvard subject headings:
Abkhazo-Adyghian languages--Grammar, Historical.
Abkhazo-Adyghian languages--Lexicology, Historical.
Abkhazo-Adyghian languages--Phonology, Historical.
Princeton subject headings:
Caucasian languages--Lexicology.
Caucasian languages--Morphology.
Caucasian languages--Phonology, Historical.