Collins, D. (2003). Carrier grade voice over IP (Second edition.). McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCollins, Daniel. Carrier Grade Voice over IP. Second edition. New York: McGraw-Hill, 2003.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCollins, Daniel. Carrier Grade Voice over IP. Second edition. McGraw-Hill, 2003.
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