GROVER DERRICK. (1989). PROTECTION OF COMPUTER SOFTWARE - ITS TECHNOLOGY AND APPLICATIONS. CAMBRIDGE UNIVERSITY PRESS.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGROVER DERRICK. PROTECTION OF COMPUTER SOFTWARE - ITS TECHNOLOGY AND APPLICATIONS. NEW YORK: CAMBRIDGE UNIVERSITY PRESS, 1989.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGROVER DERRICK. PROTECTION OF COMPUTER SOFTWARE - ITS TECHNOLOGY AND APPLICATIONS. CAMBRIDGE UNIVERSITY PRESS, 1989.
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