Columbia subject headings:
Literature.
Petrarca, Francesco, 1304-1374--Books and reading.
Petrarca, Francesco, 1304-1374--Knowledge and learning.
Harvard subject headings:
Petrarca, Francesco, 1304-1374--Books and reading.
Petrarca, Francesco, 1304-1374--Knowledge--Literature.
Petrarca, Francesco, 1304-1374--Library.
Princeton subject headings: