1. University of Pennsylvania, Misc Mss Box 10 Folder 16 DS ID: DS819 Title: Letter Author: Juana I of Castile Date: 1498 1 November.
2. University of Pennsylvania, CAJS Rar Ms 559e DS ID: DS25934 Title: Letter Author: Natan-Noṭe ben David, (Ożarów, Poland) Place: Danzig Date: 12 Elul 5529 (11 January 1769)