1.
Official Website of St. Peter's Basilica .
St. Peter's Basilica.
2.
Giddings, Al (producer), Alexander Grasshoff (producer), James Lipscomb (producer), and Bud Wiser (producer).
National Geographic Inside the Vatican.
National Geographic Video.
3.
Hersey, George L..
High Renaissance Art in St. Peter's and the Vatican: An Interpretive Guide .
4.
Matilda Webb.
The Churches and Catacombs of Early Christian Rome: A Comprehensive Guide .
pp. 6-13.
Sussex Academic Press,
2001.
5.
Mcdowell, Bart and James L. Stanfield (photographer).
Inside the Vatican .
National Geographic,
2009.
6.
Scotti, R. A..
Basilica: The Splendor and the Scandal: Building St. Peter's .
Plume,
2007.
7.
Tronzo, William (ed.).
St. Peter's in the Vatican .
Cambridge University Press,
2005.