Farrell, J. v. R. (1980). Prices as signals of quality. University of Oxford.
Lua i Stíl Chicago (17ú heag.)Farrell, Joseph von Rosthorn. Prices as Signals of Quality. England: University of Oxford, 1980.
Lua MLA (8ú heag.)Farrell, Joseph von Rosthorn. Prices as Signals of Quality. University of Oxford, 1980.
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