Cita APA (7th ed.)

Schmidt; Friend. IP Telephony Using CallManager Express Lab Portfolio (1.). Pearson India.

Cita Chicago (17th ed.)

Schmidt; Friend. IP Telephony Using CallManager Express Lab Portfolio. 1. Pearson India.

Cita MLA (8th ed.)

Schmidt; Friend. IP Telephony Using CallManager Express Lab Portfolio. 1. Pearson India.

Atenció: Aquestes cites poden no estar 100% correctes.