Columbia subject headings:
Harvard subject headings:
Architecture, Byzantine--Turkey--Istanbul--History.
Ayasofya Müzesi--History.
Istanbul (Turkey)--Buildings, structures, etc.--History
Princeton subject headings:
Architecture, Byzantine--Turkey--Istanbul--History.
Ayasofya Müzesi--History.
Church architecture--Turkey--Istanbul--History.
Istanbul (Turkey)--Buildings, structures, etc.--History.