Source images IDS 20554 BCz, 244, p. 125-126, p. 126 beginning of the letter (Latin office copy in secretary's hand)
Facsimile of the source from the collection of Muzeum Narodowe w Krakowie, Biblioteka Czartoryskich, 244, p. 125-126; copying, dissemination or publication in any form (including electronic) solely with prior written permission from the source's owner.