@book{13351,
	author = {Kirkwood, Betty R. and Sterne, Jonathan A. C. and ebrary, Inc.},
	title = {Essential medical statistics},
	publisher = {Blackwell Pub.,},
	year = {2003.},
	address = {Malden, Mass. :},
	edition = {2nd ed.},
	url = {http://ezproxy.cc.andrews.edu/login?URL=http://site.ebrary.com/lib/andrews/Doc?id=10419207}
}