BROWN KEVIN. (2004). IP TELEPHONY UNVEILED. PEARSON EDUCATION.
Cita Chicago (17th ed.)BROWN KEVIN. IP TELEPHONY UNVEILED. ENGLAND: PEARSON EDUCATION, 2004.
Cita MLA (9th ed.)BROWN KEVIN. IP TELEPHONY UNVEILED. PEARSON EDUCATION, 2004.
Atenció: Aquestes cites poden no estar 100% correctes.