Basilica di San Petronio Bologna, Italy
- 1. Basilica di San Petronio. official website.
- 2. Basilica of San Petronio. Bologna Welcome.
- 3. Basilica di San Petronio. official website.
- 4. Blanchard, Paul. Blue Guide Northern Italy. pp. 572-76. Somerset Books (UK); WW Norton & Company (USA), 2005.
- 5. Donati, Silvia. 8 Things to Know about Bologna’s Basilica of San Petronio. bolognauncovered.com. 2016.