Harlow, A. F. (1936). Old wires and new waves: The history of the telegraph, telephone, and wireless. New York,London: Appleton-Century company, incorporated.
Παραπομπή Chicago StyleHarlow, Alvin Fay. Old Wires and New Waves: The History of the Telegraph, Telephone, and Wireless. New York,London: Appleton-Century company, incorporated, 1936.
Παραπομπή MLAHarlow, Alvin Fay. Old Wires and New Waves: The History of the Telegraph, Telephone, and Wireless. New York,London: Appleton-Century company, incorporated, 1936.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.