Columbia subject headings:
Armenians--Turkey--Istanbul.
Christians--Turkey--Istanbul.
Church buildings--Turkey--Istanbul--History.
Church decoration and ornament--Turkey--Istanbul--History.
Cultural property--Turkey--Istanbul--History.
Greeks--Turkey--Istanbul.
Istanbul (Turkey)--Buildings, structures, etc.--History.
Religious architecture--Turkey--Istanbul--History.
Harvard subject headings:
Church buildings--Turkey--Istanbul.
Istanbul (Turkey)--Buildings, structures, etc.
Princeton subject headings:
Church architecture--Turkey--Istanbul.
Church buildings--Turkey--Istanbul.
Istanbul (Turkey)--Buildings, structures, etc.