GROSS, C. W., & GROSS, C. W. (1976). Business Forecasting Charles W. Gross And Robin T. Peterson. Houghton Mifflin Company.
Lua i Stíl Chicago (17ú heag.)GROSS, Charles W., agus Charles W. GROSS. Business Forecasting Charles W. Gross And Robin T. Peterson. Houghton Mifflin Company, 1976.
Lua MLA (8ú heag.)GROSS, Charles W., agus Charles W. GROSS. Business Forecasting Charles W. Gross And Robin T. Peterson. Houghton Mifflin Company, 1976.
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