Collins, D. (2001). Carrier grade voice over IP. McGraw-Hill.
Cita Chicago Style (17a ed.)Collins, Daniel. Carrier Grade Voice over IP. New York: McGraw-Hill, 2001.
Cita MLA (9a ed.)Collins, Daniel. Carrier Grade Voice over IP. McGraw-Hill, 2001.
Precaución: Estas citas no son 100% exactas.