Columbia subject headings:
Architecture, Norman--Italy--Sicily.
Architecture--Italy--Sicily.
Islamic architecture--Italy--Sicily.
Harvard subject headings:
Architecture, Medieval--Italy--Sicily.
Architecture, Norman--Italy--Sicily--Arab influences.
Architecture--Italy--Sicily.
Islamic architecture--Italy--Sicily.
Normans--Italy--Sicily--History--To 1500.
Princeton subject headings:
Architecture, Medieval--Italy--Sicily.
Architecture, Norman.
Architecture--Italy--Sicily.
Islamic architecture--Italy--Sicily.