Columbia subject headings:
Harvard subject headings:
Byzantine chants--History and criticism.
Church music--Orthodox Eastern Church
Church music--Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ
Princeton subject headings:
Byzantine chants--History and criticism.
Church music--Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ.