Columbia subject headings:
Harvard subject headings:
Petrarca, Francesco, 1304-1374--Knowledge--History.
Petrarca, Francesco, 1304-1374--Political and social views.
Princeton subject headings:
Petrarca, Francesco, 1304-1374--Criticism and interpretation.
Petrarca, Francesco, 1304-1374--Knowledge--History.
Petrarca, Francesco, 1304-1374--Knowledge--Political science.