@book{189410,
	author = {Chernick , Michael R. and Friis, Robert H.},
	title = {Introductory biostatistic for the health science},
	publisher = {Wiley-Interscience},
	year = {c2003.},
	series = {Wiley series in probability and statistics},
	address = {Hoboken, N.J.}
}