Cita APA (7a ed.)

Johnston, A. B. (2009). SIP: Understanding the Session Initiation Protocol, Third Edition (3rd ed.). Artech House.

Cita Chicago Style (17a ed.)

Johnston, Alan B. SIP: Understanding the Session Initiation Protocol, Third Edition. 3rd ed. Norwood: Artech House, 2009.

Cita MLA (8a ed.)

Johnston, Alan B. SIP: Understanding the Session Initiation Protocol, Third Edition. 3rd ed. Artech House, 2009.