ULLMANN, J. E. (1976). Theory And Problems Of Quantitative Methods In Management John E. Ullmann. McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रULLMANN, John E. Theory And Problems Of Quantitative Methods In Management John E. Ullmann. McGraw-Hill, 1976.
एमएलए (8वां संस्करण) प्रशस्ति पत्रULLMANN, John E. Theory And Problems Of Quantitative Methods In Management John E. Ullmann. McGraw-Hill, 1976.
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