Não informado. (1961). Operations Research/Management Science. Executive Sciences Institute.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Operations Research/Management Science. Davenport, Iowa: Executive Sciences Institute, 1961.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Operations Research/Management Science. Executive Sciences Institute, 1961.
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