Columbia subject headings:
Leopardi, Giacomo, 1798-1837--Philosophy.
Leopardi, Giacomo, 1798-1837--Poetic works.
Harvard subject headings:
Leopardi, Giacomo, 1798-1837--Philosophy.
Leopardi, Giacomo, 1798-1837--Poetic works.
Princeton subject headings:
Leopardi, Giacomo, 1798-1837--Criticism and interpretation.