APA (7th ed.) Citation

Kelly, D., Jennings, C., & Dang, L. (2002). Practical VoIP Using VOCAL (1st edition.). O'Reilly Media, Inc..

Chicago Style (17th ed.) Citation

Kelly, David, Cullen Jennings, and Luan Dang. Practical VoIP Using VOCAL. 1st edition. O'Reilly Media, Inc., 2002.

MLA (9th ed.) Citation

Kelly, David, et al. Practical VoIP Using VOCAL. 1st edition. O'Reilly Media, Inc., 2002.