@book{32161,
	author = {Forthofer, Ron N., and Lee, Eun Sul.},
	title = {Biostatistics :},
	publisher = {Elsevier Academic Press,},
	year = {c2007.},
	address = {Burlington, MA :},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0726/2007275569-d.html}
}