@book{4124,
	author = {Royster, Julia Doswell, and Royster, Larry H.},
	title = {Hearing conservation programs :},
	publisher = {Lewis Publishers,},
	year = {c1990.},
	address = {Chelsea, Mich. :},
	url = {http://www.loc.gov/catdir/enhancements/fy0744/89048503-d.html}
}