Cita APA (7a ed.)

Black, U. D. (2000). Voice over IP. Prentice-Hall.

Cita Chicago Style (17a ed.)

Black, Uyless D. Voice over IP. Upper Saddle River, New Jersey: Prentice-Hall, 2000.

Cita MLA (9a ed.)

Black, Uyless D. Voice over IP. Prentice-Hall, 2000.