APA (7th ed.) Citation

Merel, D., Dempster, B., & Gomillion, D. (2009). Asterisk 1.6: Build feature-rich telephony systems with Asterisk. Packt Pub..

Chicago Style (17th ed.) Citation

Merel, David, Barrie Dempster, and David Gomillion. Asterisk 1.6: Build Feature-rich Telephony Systems with Asterisk. Birmingham, U.K.: Packt Pub., 2009.

MLA (8th ed.) Citation

Merel, David, et al. Asterisk 1.6: Build Feature-rich Telephony Systems with Asterisk. Packt Pub., 2009.