APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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