American Telephone and Telegraph Company. (1978). The bell journal of economics: Autumn 1978. American Telephone and Telegraph Company.
Citace podle Chicago (17th ed.)American Telephone and Telegraph Company. The Bell Journal of Economics: Autumn 1978. Lancaster: American Telephone and Telegraph Company, 1978.
Citace podle MLA (9th ed.)American Telephone and Telegraph Company. The Bell Journal of Economics: Autumn 1978. American Telephone and Telegraph Company, 1978.
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