1. Asimov, I. (1979). A choice of catastrophes. New York: Fawcett Columbine.
2. Diamond, J. (1998). Guns, germs and steel. New York: Vintage Books.
3. Hounshell, DA. (1984). From the American system to mass production, 1800–1932: The development of manufacturing technology in the United States. Vol. 4. Baltimore MD: Johns Hopkins University Press.
4. Perrin. (1979). “Giving Up the Gun: Japan’s Reversion to the Sword, 1543–1879.”122.