1. Harry Ransom Center, MS 3327, Container 196 DS ID: DS3982 Title: Papal bull Author: Sixtus IV Place: Italy and Rome Date: 1474 February 7
2. Newberry Library, VAULT Wing MS oversize ZW 5351 .96 DS ID: DS18066 Title: Letter Author: Catholic Church and Clement VIII Place: Rome Date: 1596.