VALENTINE,LLOYD. (1983). Business Cycless Forecasting - Lloyd M. Valentine, Carl A.Dauten. South-Western.
Lua i Stíl Chicago (17ú heag.)VALENTINE,LLOYD. Business Cycless Forecasting - Lloyd M. Valentine, Carl A.Dauten. South-Western, 1983.
Lua MLA (8ú heag.)VALENTINE,LLOYD. Business Cycless Forecasting - Lloyd M. Valentine, Carl A.Dauten. South-Western, 1983.
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