APA (7th ed.) Citation

Johnston, A. (2016). SIP: Understanding the session initiation protocol (Fourth edition.). Artech House.

Chicago Style (17th ed.) Citation

Johnston, Alan. SIP: Understanding the Session Initiation Protocol. Fourth edition. Boston, MA: Artech House, 2016.

MLA (9th ed.) Citation

Johnston, Alan. SIP: Understanding the Session Initiation Protocol. Fourth edition. Artech House, 2016.

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