Cita APA (7th ed.)

American Telephone and Telegraph Company. (1979). The bell journal of economics. American Telephone and Telegraph Company.

Cita Chicago (17th ed.)

American Telephone and Telegraph Company. The Bell Journal of Economics. Lancaster: American Telephone and Telegraph Company, 1979.

Cita MLA (9th ed.)

American Telephone and Telegraph Company. The Bell Journal of Economics. American Telephone and Telegraph Company, 1979.