1. Princeton University, 25.3 DS ID: DS3170 Title: Autograph letter signed : Wittenberg, to John the Steadfast, Elector of Saxony, Date: 1525 July 27].
2. Harvard University, MS Ger 77 DS ID: DS11188 Title: Von den Frondiensten Author: Philipp Melanchthon Date: 1549.