@book{220596,
	author = {United States},
	title = {Law enforcement officers killed and assaulted},
	publisher = {Federal Bureau of Investigation},
	address = {Clarksburg, WV},
	note = {Description based on: 1996; title from PDF cover (viewed May 3, 2001)},
	url = {http://purl.access.gpo.gov/GPO/LPS700}
}