@book{197891,
	author = {Purpura, Philip P.},
	title = {Security and loss prevention},
	publisher = {Butterworth-Heinemann},
	year = {c2002.},
	address = {Boston},
	edition = {4th ed.},
	url = {http://www.loc.gov/catdir/description/els031/2001058969.html}
}