Columbia subject headings:
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--Catechisms.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--Clergy.
Harvard subject headings:
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--Catechisms.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--Clergy.
Princeton subject headings: