@book{3887,
	author = {Checkoway, Harvey. and Pearce, Neil.},
	title = {Research methods in occupational epidemiology /},
	publisher = {Oxford University Press,},
	year = {c2004.},
	address = {New York :},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/toc/fy043/2003053095.html}
}