Davidson, J. (2000). Voice over IP fundamentalsJonathan Davidson, James Peters. Cisco.
Lua i Stíl Chicago (17ú heag.)Davidson, Jonathan. Voice over IP FundamentalsJonathan Davidson, James Peters. Cisco, 2000.
Lua MLA (8ú heag.)Davidson, Jonathan. Voice over IP FundamentalsJonathan Davidson, James Peters. Cisco, 2000.
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