Columbia subject headings:
Giotto, 1266?-1337--Criticism and interpretation.
Painting, Medieval--Italy.
Polyptychs--Italy--Bologna.
Harvard subject headings:
Giotto, 1266?-1337--Congresses.
Painting, Gothic--Italy--Bologna--Congresses.
Painting, Italian--Italy--Bologna--Congresses.
Princeton subject headings:
Giotto, 1266?-1337--Congresses.
Painting, Gothic--Italy--Bologna--Congresses.
Painting, Italian--Italy--Bologna--Congresses.