@book{329967,
	author = {Morton, Richard F., and Hebel, J. Richard},
	title = {A study guide to epidemiology and biostatistics /},
	publisher = {Aspen Publishers,},
	year = {1990.},
	address = {Rockville, Md. :},
	edition = {3rd ed.},
	note = {"Includes 125 multiple-choice review questions."}
}