- Two Counters at the Counting Table (Ungler 1513)
- Two Counters at the Counting Table. In Jan of Łańcut, Algorithmus Linealis cu[m] pulchris condicionibus dua[rum] regula[rum], Cracow: Florian Ungler (printer), 24 February 1513 (Wrocław, Oss.), fol. A1r ◼
- Two Counters at the Counting Table. In Johannes de Sacrobosco, Algorithmus Johannis de Sacro Busto, Cracow: Florian Ungler (printer), Jan Haller (publisher), 1513 (Kórnik, BK PAN) ◼