APA (7th ed.) Citation

Johnston, A. B. (2009). SIP: Understanding the Session Initiation Protocol, Third Edition.

Chicago Style (17th ed.) Citation

Johnston, Alan B. SIP: Understanding the Session Initiation Protocol, Third Edition. 2009.

MLA (9th ed.) Citation

Johnston, Alan B. SIP: Understanding the Session Initiation Protocol, Third Edition. 2009.

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