HAKALA, D. (1995). Modems Made Easy: The Basics And Beyond David Hakala. McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHAKALA, David. Modems Made Easy: The Basics And Beyond David Hakala. McGraw-Hill, 1995.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHAKALA, David. Modems Made Easy: The Basics And Beyond David Hakala. McGraw-Hill, 1995.
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