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#Greene, Margaret; Lesley Mathieson (2001). The Voice and its Disorders. John Wiley & Sons; 6th Edition edition. ISBN 13: 978-1861561961.  
 
#Greene, Margaret; Lesley Mathieson (2001). The Voice and its Disorders. John Wiley & Sons; 6th Edition edition. ISBN 13: 978-1861561961.  
 
#Musical roots may lie in human voice - 06 August 2003 - New Scientist
 
#Musical roots may lie in human voice - 06 August 2003 - New Scientist
      
==Further reading==
 
==Further reading==