Garnet, R. W. (1985). The Telephone Enterprise: The Evolution of the Bell System's Horizontal Structure, 1876-1909. Baltimore: The Johns Hopkins University Press.
Παραπομπή Chicago StyleGarnet, Robert W. The Telephone Enterprise: The Evolution of the Bell System's Horizontal Structure, 1876-1909. Baltimore: The Johns Hopkins University Press, 1985.
Παραπομπή MLAGarnet, Robert W. The Telephone Enterprise: The Evolution of the Bell System's Horizontal Structure, 1876-1909. Baltimore: The Johns Hopkins University Press, 1985.
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