@book{1649,
	author = {Ball, Martin J and Fiona E Gibbon},
	title = {Handbook of vowels and vowel disorders},
	publisher = {Pearson},
	year = {2013},
	address = {New York },
	edition = {1st},
	url = {https://books.google.com.pk/books?id=yiVR3Hk7U3wC&pg=PT6&dq=9781848726123&hl=en&sa=X&ved=0ahUKEwju97eXqN_bAhVK1hQKHeNkBGsQ6AEIJDAA#v=onepage&q=9781848726123&f=false}
}