APA (7th ed.) Citation

Bell Telephone Laboratories, inc. (1971). Transmission systems for communications (rev. 4th ed.). Bell Telephone Laboratories.

Chicago Style (17th ed.) Citation

Bell Telephone Laboratories, inc. Transmission Systems for Communications. rev. 4th ed. [New York?]: Bell Telephone Laboratories, 1971.

MLA (9th ed.) Citation

Bell Telephone Laboratories, inc. Transmission Systems for Communications. rev. 4th ed. Bell Telephone Laboratories, 1971.