1. Wellesley College, P946 DS ID: DS12777 Title: De vita solitaria Author: Peter Damian Place: Northern France and Flanders Date: between 1400 and 1450
2. Newberry Library, VAULT folio Case MS 95 DS ID: DS17792 Title: De vita solitaria Author: Petrarch Place: Lombardy Date: between 1425 and 1464