1. University of Pennsylvania, Ms. Coll. 742 Folder 17 DS ID: DS1834 Title: Records Author: Carlo Blasii de Piccolomini Date: 1363.
2. University of Pennsylvania, Ms. Coll. 742 Folder 34 DS ID: DS1853 Title: Notarial document Author: Università de' mercanti (Siena) Date: 1439.