American Telephone and Telegraph Company. (1978). The bell journal of economics: Autumn 1978. American Telephone and Telegraph Company.
Chicago-Zitierstil (17. Ausg.)American Telephone and Telegraph Company. The Bell Journal of Economics: Autumn 1978. Lancaster: American Telephone and Telegraph Company, 1978.
MLA-Zitierstil (9. Ausg.)American Telephone and Telegraph Company. The Bell Journal of Economics: Autumn 1978. American Telephone and Telegraph Company, 1978.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.