Cita APA (7a ed.)

Dang, L., Jennings, C., & Kelly, D. (2002). Practical VoIP using Vocal. O'Reilly.

Cita Chicago Style (17a ed.)

Dang, Luan, Cullen Jennings, y David Kelly. Practical VoIP Using Vocal. Sebastopol, CA: O'Reilly, 2002.

Cita MLA (9a ed.)

Dang, Luan, et al. Practical VoIP Using Vocal. O'Reilly, 2002.