ペトラルカ
↑ J.H. Plumb(英語版), The Italian Renaissance, 1961; Chapter XI by Morris Bishop "Petrarch", pp. 161–175; New York, American Heritage Publishing, ISBN 0-618-12738-0
↑ Plumb, p. 164
↑ Pietrangeli (1981), p. 32
↑ Kirkham, Victoria (2009). Petrarch: A Critical Guide to the Complete Works. Chicago: University of Chicago Press. p. 9. ISBN 978-0226437439. https://books.google.com/books?id=iGDdF667hosC&q=giordano+orsini+1341&pg=PA9