Roach, Peter. <br/><br/>
English Phonetics and Phonology: A Practical Course /  

 - 1st ed /  
 - Cambridge CB2 1RP :   Cambridge University Press. 
 - p.211 :  
<br/><br/><label>ISBN: </label>0-521-28252-7 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Phonology
<br/><br/><label>Dewey Class. No.: </label>P111:1  / M3