Cita APA (7a ed.)

Bell telephone Laboratories. (1970). Transmission systems for communications (4th. ed.). Bell Telephone Laboratories.

Cita Chicago Style (17a ed.)

Bell telephone Laboratories. Transmission Systems for Communications. 4th. ed. USA: Bell Telephone Laboratories, 1970.

Cita MLA (8a ed.)

Bell telephone Laboratories. Transmission Systems for Communications. 4th. ed. Bell Telephone Laboratories, 1970.