Columbia subject headings:
Art--Italy--Monreale--Guidebooks.
Art--Italy--Palermo--Guidebooks.
Palermo (Italy)--Guidebooks.
Harvard subject headings:
Art--Italy--Monreale--Guidebooks.
Art--Italy--Palermo--Guidebooks.
Palermo (Italy)--Guidebooks.
Princeton subject headings:
Art--Italy--Monreale--Guidebooks.
Art--Italy--Palermo--Guidebooks.
Guidebooks.
Palermo (Italy)--Guidebooks.