APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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