APA (7th ed.) Citation

Seagren, E. (2006). Secure your network for free: Using Nmap, Wireshark, Snort, Nessus, and MRTG. Syngress.

Chicago Style (17th ed.) Citation

Seagren, Eric. Secure Your Network for Free: Using Nmap, Wireshark, Snort, Nessus, and MRTG. Rockland, Mass: Syngress, 2006.

MLA (9th ed.) Citation

Seagren, Eric. Secure Your Network for Free: Using Nmap, Wireshark, Snort, Nessus, and MRTG. Syngress, 2006.

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