1. Attributed to King Matthias Corvinus (1443–1490), In W. Stirling, “Klosterleben Kaiser Karls,” Vol. V. Leipzig, 1852.
2. “The Computer from Pascal to von Neumann.”;Goldstine,1972
3. “Von himmlischen Uhrwerk zur statistischen Fabrik”;Adam,1973
4. H. Zemanek, A life story of J. N. Maelzel (to be written).
5. “The Great Chess Automation.”;Carroll,1975