Charles Burroughs, Michelangelo at the Campidoglio: Artistic Identity, Patronage, and Manufacture (IRSA s.c., 1993) pp. 91 "Palazzo dei Conservatori, Campidoglio (The Capitoline Hill)" Accessed March 21, 2012 [1]보관됨 2012-02-04 - 웨이백 머신
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Charles Burroughs, Michelangelo at the Campidoglio: Artistic Identity, Patronage, and Manufacture (IRSA s.c., 1993) pp. 91 "Palazzo dei Conservatori, Campidoglio (The Capitoline Hill)" Accessed March 21, 2012 [1]보관됨 2012-02-04 - 웨이백 머신