1. Stevin, English translation by Robert Norton: "Disme: the Art of Tenths; or Decimall Arithmeticke" (1608).
2. Hessen, B., "The Social and Economic Roots of Newton's Principia", in "Science at the Cross Roads", N.I. Bukharin et al. (1931).
3. "Handbook of the Napier Tercentenary Exhibition", ed. E. M. Horsburgh (1914). Contains an account of the life and work of Napier, detailed descriptions of many mathematical machines and instruments and various other matters up to 1914.
4. Wolf, A., "A History of Science, Technology and Philosophy in the 16th and 17th Centuries" (1935), 560–63. Wolf, A., "A History of Science, Technology and Philosophy in the 18th Century" (1938), 654–60.
5. Comrie, L. J., "Calculating Machines", being Appendix III to L. R. Connor's "Statistics in Theory and Practice" (1938) (published separately). The best concise account of modern calculating machines.