Manuscript sources: 1 | fair copy in Polish, in secretary's hand, AAWO, AB, D. 70, f. 353-354
| 2 | register in Latin, paraphrase contains the beginning of the letter, which is missing in the Polish fair copy; this paraphrase is not entirely consistent with the Polish text, 16th-century, AAWO, AB, D. 70, f. 303r-v
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