Não informado. (1968). Modern data products, systems, services. Modern Data Services.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Modern Data Products, Systems, Services. Framingham, Mass: Modern Data Services, 1968.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Modern Data Products, Systems, Services. Modern Data Services, 1968.
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