Columbia subject headings:
Architecture, Byzantine--Turkey--Istanbul.
Church architecture--Conservation and restoration.
Church buildings--Turkey--Istanbul.
Harvard subject headings:
Architecture, Byzantine--Turkey--Istanbul
Buildings--Remodeling for other use--Turkey--Istanbul.
Church architecture--Conservation and restoration.
Church buildings--Turkey--Istanbul.
Princeton subject headings:
Architecture, Byzantine--Turkey--Istanbul.
Church architecture--Conservation and restoration.
Churches buildings--Turkey--Istanbul.