@book{199495,
	author = {Maxfield, Michael G. and Babbie, Earl R.},
	title = {Research methods for criminal justice and criminology},
	publisher = {Wadsworth Thomson Learning},
	year = {c2005.},
	address = {Belmont, CA},
	edition = {4th ed.},
	note = {ESTE LIBRO INCLUYE UN DISCO}
}