APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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