Literatur
- [Davidson 1976, S. 407] „No documents have been found for Sangallo’s construction of the windows, which presumably, therefore, were completed before the existing accounts [für die Glasfenster] begin in 1542.“
- [Isselt 1954–1955]
- [Berckenhagen 1970, S. 26] „Architektonische Details des Vatikans, recto und verso, 432 × 303“