Columbia subject headings:
Architecture, Byzantine--Turkey--Sakarya--History.
Castles--Turkey--Adapazarı--History.
Castles--Turkey--Sakarya İli--History.
Sakarya İli (Turkey)--History.
Harvard subject headings:
Architecture, Byzantine--Turkey--Sakarya--History.
Castles--Turkey--Adapazarı--History.
Castles--Turkey--Sakarya İli--History.
Sakarya İli (Turkey)--History.
Princeton subject headings: