@book{306,
	author = {Bullock, Jane A., and Haddow, George D.,},
	title = {Introduction to homeland security :},
	publisher = {Butterworth-Heinemann is an imprint of Elsevier,},
	year = {[2021]},
	address = {Oxford, United Kingdom ;},
	edition = {Sixth edition.},
	note = {Previous edition: 2015.}
}