@book{67449,
	author = {Stewart, James Michael.},
	title = {Network security firewalls and VPNs /},
	publisher = {Jones & Bartlett Learning,},
	year = {c2011.},
	address = {Sudbury, MA :},
	url = {http://proquest.safaribooksonline.com/book/networking/security/9780763791308}
}