Medieval Fortress: Castles, Forts and Walled Cities of the Middle Ages. Da Capo Press(英语:Da Capo Press). 2004 [2024-01-15]. ISBN 978-0-2747-9776-9. (原始内容存档于2024-05-06)
1559 Paul IV Pirro Ligorio (design) Giacomo da Castignola, Tommaso della Porta, Gian Pietro Annon, and Rocco da Montefiascone (sculpted) Santa Maria sopra