Gaya APA
Wallace, Kevin. (2008).
Voice over ip first - step .
America:
Cisco Press.
Gaya Chicago
Wallace, Kevin.
Voice over ip first - step.
America:
Cisco Press,
2008.
Text.
Gaya MLA
Wallace, Kevin.
Voice over ip first - step.
America:
Cisco Press,
2008.
Text.
Gaya Turabian
Wallace, Kevin.
Voice over ip first - step.
America:
Cisco Press,
2008.
Print.