APA (7th ed.) Citation

Johnston, A. B. (2004). SIP: Understanding the Session Initiation Protocol, Second Edition.

Chicago Style (17th ed.) Citation

Johnston, Alan B. SIP: Understanding the Session Initiation Protocol, Second Edition. 2004.

MLA (9th ed.) Citation

Johnston, Alan B. SIP: Understanding the Session Initiation Protocol, Second Edition. 2004.

Warning: These citations may not always be 100% accurate.