TY  - BOOK
AU  - Ball, Martin J
AU  - Fiona E Gibbon
TI  - Handbook of vowels and vowel disorders
SN  - 9781848726123
PY  - 2013///
CY  - New York 
PB  - Pearson
UR  - 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
ER  -