@book{204773,
	author = {Johnston, Linda. and Beard, Lawrence A.},
	title = {Assistive technology},
	publisher = {Pearson/Prentice Hall},
	year = {c2007.},
	address = {Upper Saddle River, N.J.},
	url = {http://www.loc.gov/catdir/toc/ecip0615/2006019849.html}
}