Columbia subject headings:
Bulgarian language--Grammar, Historical.
Church Slavic language--Bulgarian recension.
Church Slavic language--Declension.
Harvard subject headings:
Bulgarian language--Grammar, Historical.
Church Slavic language--Bulgarian recension
Church Slavic language--Declension.
Princeton subject headings:
Bulgarian language--Grammar, Historical.
Church Slavic language--Bulgarian recension.
Church Slavic language--Declension.