Fry, D.B.. <br/><br/>
Acoustic Phonetics: Acourse of Basic readings /  
edited by D.B. Fry. 
 - 1st ed /  
 - Cambridge CB2 1RP :   Cambridge University Press. 
 - p.469 :  
<br/><br/><label>ISBN: </label>0-521-21393-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Linguistics
<br/><br/><label>Dewey Class. No.: </label>P1  / L6