APA (7th ed.) Citation

American Telephone and Telegraph Company & American Telephone and Telegraph Company. Information Department. Bell Telephone magazine. American Telephone and Telegraph Co..

Chicago Style (17th ed.) Citation

American Telephone and Telegraph Company and American Telephone and Telegraph Company. Information Department. Bell Telephone Magazine. New York: American Telephone and Telegraph Co..

MLA (9th ed.) Citation

American Telephone and Telegraph Company and American Telephone and Telegraph Company. Information Department. Bell Telephone Magazine. American Telephone and Telegraph Co..