TOM McARTHUR. "VOCAL CORDS." Concise Oxford Companion to the English Language. 1998. Encyclopedia.com. 15 Nov. 2009 <http://www.encyclopedia.com>.
TOM McARTHUR. "VOCAL CORDS." Concise Oxford Companion to the English Language. 1998. Encyclopedia.com. (November 15, 2009). http://www.encyclopedia.com/doc/1O29-VOCALCORDS.html
TOM McARTHUR. "VOCAL CORDS." Concise Oxford Companion to the English Language. 1998. Retrieved November 15, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O29-VOCALCORDS.html