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