Columbia subject headings:
Architecture--Turkey--Istanbul.
Istanbul (Turkey)--Buildings, structures, etc.
Istanbul (Turkey)--Description and travel.
Harvard subject headings:
Architecture--Turkey--Istanbul
Istanbul (Turkey)--Buildings, structures, etc.
Istanbul (Turkey)--Description and travel
Princeton subject headings:
Architecture--Turkey--Istanbul.
Istanbul (Turkey)--Buildings, structures, etc.
Istanbul (Turkey)--Description and travel.