Gaston Tissandier e Henry Frith

Half Hours of Scientific Amusement; or practical physics and chemistry without apparatus

Ward, Lock and Co., New York 1890.

Gaston Tissandier

Le calculateur Inaudi

La Nature, N. 979, Vol. 20, G. Masson, Paris 5 mars 1892, pp. 217-218.

Gaston Tissandier

Inaudi, the calculator

Scientific American, N. 15, Vol. 66, Munn & Co., New York 9 avril 1892, p. 230.