Não informado. (1969). Data base. Association for Computing Machinery, Special Interest Group on Business Data Processing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Data Base. New York: Association for Computing Machinery, Special Interest Group on Business Data Processing, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Data Base. Association for Computing Machinery, Special Interest Group on Business Data Processing, 1969.
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