Columbia subject headings:
Harvard subject headings:
Proto-Slavic language--Etymology.
Proto-Slavic language--Morphophonemics.
Proto-Slavic language--Word formation.
Princeton subject headings:
Proto-Slavic language--Etymology.
Proto-Slavic language--Morphology.
Proto-Slavic language--Word formation.
Slavic languages--Grammar, Comparative.
Slavic languages--Grammar, Historical.