Johnston, A. B. (2004). SIP: Understanding the Session Initiation Protocol (2nd ed.). Artech House.
Cita Chicago (17th ed.)Johnston, Alan B. SIP: Understanding the Session Initiation Protocol. 2nd ed. Boston: Artech House, 2004.
Cita MLA (9th ed.)Johnston, Alan B. SIP: Understanding the Session Initiation Protocol. 2nd ed. Artech House, 2004.
Atenció: Aquestes cites poden no estar 100% correctes.