APA (7th ed.) Citation
Williamson, M. (2011). pfSense 2 cookbook: A practical, example-driven guide to configure even the most advanced features of pfSense 2. Packt Open Source.
Chicago Style (17th ed.) Citation
Williamson, Matt. PfSense 2 Cookbook: A Practical, Example-driven Guide to Configure Even the Most Advanced Features of PfSense 2. Birmingham, U.K.: Packt Open Source, 2011.
MLA (9th ed.) Citation
Williamson, Matt. PfSense 2 Cookbook: A Practical, Example-driven Guide to Configure Even the Most Advanced Features of PfSense 2. Packt Open Source, 2011.
Warning: These citations may not always be 100% accurate.