Não informado. (1975). The Bell Journal of Economics. American Telephone and Telegraph Company.
Chicago-Zitierstil (17. Ausg.)Não informado. The Bell Journal of Economics. New York: American Telephone and Telegraph Company, 1975.
MLA-Zitierstil (8. Ausg.)Não informado. The Bell Journal of Economics. American Telephone and Telegraph Company, 1975.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.