Headrick, D. R. (1991). The invisible weapon: Telecommunications and international politics 1851-1945. New York: Oxford University Press.
Παραπομπή Chicago StyleHeadrick, Daniel R. The Invisible Weapon: Telecommunications and International Politics 1851-1945. New York: Oxford University Press, 1991.
Παραπομπή MLAHeadrick, Daniel R. The Invisible Weapon: Telecommunications and International Politics 1851-1945. New York: Oxford University Press, 1991.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.