APA (7th ed.) Citation

Hay, A., Hay, K., & Giannoulis, P. (2009). Nokia Firewall, VPN, and IPSO Configuration Guide (1st edition.). Syngress.

Chicago Style (17th ed.) Citation

Hay, Andrew, Keli Hay, and Peter Giannoulis. Nokia Firewall, VPN, and IPSO Configuration Guide. 1st edition. Syngress, 2009.

MLA (9th ed.) Citation

Hay, Andrew, et al. Nokia Firewall, VPN, and IPSO Configuration Guide. 1st edition. Syngress, 2009.