1. Newberry Library, VAULT Wing MS ZW 5351 .92 DS ID: DS17895 Title: Indulgence Author: Clement VIII Place: Rome Date: 1592
2. Newberry Library, VAULT folio Case MS 150 DS ID: DS18203 Title: Indulgence and Letter Author: Catholic Church and Sixtus IV Place: Florence and Italy Date: 1481 April 25.