Columbia subject headings:
Art--Vatican City--Guidebooks.
Vatican City--Description and travel.
Vatican City--Guidebooks.
Harvard subject headings:
Art--Vatican City--Guidebooks.
Vatican City--Description and travel.
Vatican City--Guidebooks.
Princeton subject headings:
Architecture, Renaissance--Vatican City--Guidebooks.
Art--Vatican City--Guidebooks.
Guidebooks.
Vatican City--Description and travel.
Vatican City--Guidebooks.