Cita APA (7th ed.)

Bell Telephone Laboratories. (1971). Transmission systems for communications (Rev. 4th ed.). Bell Telephone Lab..

Cita Chicago (17th ed.)

Bell Telephone Laboratories. Transmission Systems for Communications. Rev. 4th ed. New York: Bell Telephone Lab., 1971.

Cita MLA (8th ed.)

Bell Telephone Laboratories. Transmission Systems for Communications. Rev. 4th ed. Bell Telephone Lab., 1971.