@book{56663,
	author = {Ratelle, Sylvie. and ebrary, Inc.},
	title = {Preventive medicine and public health},
	publisher = {McGraw Hill, Health Professions Division, PreTest Series,},
	year = {c2001.},
	address = {New York :},
	edition = {9th ed.},
	url = {http://site.ebrary.com/lib/strathmore/Doc?id=5004709}
}