References for Johannes Widman

  1. K Vogel, Biography in Dictionary of Scientific Biography (New York 1970-1990).
    See THIS LINK.


  2. W Kaunzner and H Wussing (eds.), Adam Ries, Coss (B G Teubner Verlagsgesellschaft mbH, Stuttgart, 1992).


  3. M Cantor, Vorlesungen über Geschichte der Mathematik II (Leipzig, 1913), 228-.
  4. K Fogel, Merchants' aids in practical arithmetic from the Middle Ages (Russian), Istor.-Mat. Issled. No. 23 (1978), 235-249; 359.