APA (7th ed.) Citation

American Telephone and Telegraph Company & Gentle, E. (1965). Data communications in business: An introduction. [publisher not identified].

Chicago Style (17th ed.) Citation

American Telephone and Telegraph Company and Edgar Gentle. Data Communications in Business: An Introduction. New York: [publisher not identified], 1965.

MLA (9th ed.) Citation

American Telephone and Telegraph Company and Edgar Gentle. Data Communications in Business: An Introduction. [publisher not identified], 1965.