Crowley, C. (2019). Operating system. McGrawHill Education, Chennai.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCrowley, Charles. Operating System. McGrawHill Education, Chennai, 2019.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCrowley, Charles. Operating System. McGrawHill Education, Chennai, 2019.
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