Columbia subject headings:
Harvard subject headings:
Architecture, Medieval--Italy--Sicily--History--Sources.
Architecture--Italy--Sicily.
Art, Italian--Italy--Sicily.
Art, Medieval--Italy--Sicily--History--Sources.
Art, Norman.
Normans--Italy--Sicily--Civilization--Sources.
Princeton subject headings:
Architecture, Medieval--Italy--Sicily.
Architecture--Italy--Sicily.
Art, Italian--Italy--Sicily.
Art, Medieval--Italy--Sicily.
Art, Norman.
Normans--Italy--Sicily--Civilization--Sources.