@book{6887,
	author = {Ball, Martin J. and Gibbon, Fiona E.},
	title = {Vowel disorders /},
	publisher = {Butterworth-Heinemann,},
	year = {c2002.},
	address = {Boston :},
	url = {http://www.loc.gov/catdir/toc/fy031/2001043714.html}
}