@book{8170,
	author = {Spasoff, R. A.},
	title = {Epidemiologic methods for health policy /},
	publisher = {Oxford University Press,},
	year = {1999.},
	address = {New York :},
	url = {http://www.loc.gov/catdir/enhancements/fy0602/98050116-d.html}
}