APA (7th ed.) Citation

(2006). VoIP/Internet telephony. Library of Congress, Science, Technology & Business Division, Science Reference Services.

Chicago Style (17th ed.) Citation

VoIP/Internet Telephony. [Washington, D.C.]: Library of Congress, Science, Technology & Business Division, Science Reference Services, 2006.

MLA (9th ed.) Citation

VoIP/Internet Telephony. Library of Congress, Science, Technology & Business Division, Science Reference Services, 2006.