Columbia subject headings:
Church architecture--Romania--Transylvania.
Fortification--Romania--Transylvania.
Fortress-churches--Romania--Transylvania.
Transylvania (Romania)--Church history.
Harvard subject headings:
Church architecture--Romania--Transylvania--History.
Fortification--Romania--Transylvania--History.
Fortress-churches--Romania--Transylvania--History.
Germans--Romania--Transylvania--History
Transylvania (Romania)--Buildings, structures, etc.
Princeton subject headings: