ULLMANN, J. E. (1976). Theory And Problems Of Quantitative Methods In Management John E. Ullmann. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)ULLMANN, John E. Theory And Problems Of Quantitative Methods In Management John E. Ullmann. McGraw-Hill, 1976.
Lua MLA (8ú heag.)ULLMANN, John E. Theory And Problems Of Quantitative Methods In Management John E. Ullmann. McGraw-Hill, 1976.
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