Não informado. (1975). The Bell Journal of Economics. American Telephone and Telegraph Company.
Lua i Stíl Chicago (17ú heag.)Não informado. The Bell Journal of Economics. New York: American Telephone and Telegraph Company, 1975.
Lua MLA (8ú heag.)Não informado. The Bell Journal of Economics. American Telephone and Telegraph Company, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.