Werner Von Siemens citáty a výroky
Werner Von Siemens: Citáty v angličtine
D. Appleton., (1887). The Popular Science Monthly, Volume 30.
Bonnier Corporation. Popular Science https://books.google.com/books?id=tyoDAAAAMBAJ&printsec=frontcover#v=onepage&q&f=false Apr 1887,Vol. 30, No. 46. [0161-7370]. pp. 814-820\
Werner von Siemens (1895). Scientific & technical papers of Werner von Siemens. J. Murray. p. 518