Cita APA (7th ed.)

HERSENT OLIVIER. (2005). IP TELEPHONY (2ND ED.). JOHN WILEY AND SONS LTD PUB.

Cita Chicago (17th ed.)

HERSENT OLIVIER. IP TELEPHONY. 2ND ED. UK: JOHN WILEY AND SONS LTD PUB, 2005.

Cita MLA (9th ed.)

HERSENT OLIVIER. IP TELEPHONY. 2ND ED. JOHN WILEY AND SONS LTD PUB, 2005.