Cita APA (7th ed.)
Johnston, A. B. (2009). SIP: Understanding the Session Initiation Protocol (3rd ed.). Artech House.
Cita Chicago (17th ed.)
Johnston, Alan B. SIP: Understanding the Session Initiation Protocol. 3rd ed. Boston, Mass.: Artech House, 2009.
Cita MLA (9th ed.)
Johnston, Alan B. SIP: Understanding the Session Initiation Protocol. 3rd ed. Artech House, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.