Cita APA (7a ed.)

O'Brien, K., & Lewis, E. (2000). Configuring cisco voice over IP. Syngress.

Cita Chicago Style (17a ed.)

O'Brien, Keith, y Elliot Lewis. Configuring Cisco Voice over IP. Rockland: Syngress, 2000.

Cita MLA (9a ed.)

O'Brien, Keith, y Elliot Lewis. Configuring Cisco Voice over IP. Syngress, 2000.