Citing from the same author in Word 2007

S

Sadeq

I have several references form the same author, same year. I want to
cite them in Chicago style. This style suggests adding English letters
to the end of such citations, for example:

(Swan 2004a)
(Swan 2004b)
..
..
..

But Word 2007 Bibliography feature does not add the English letters,
making it impossible to understand which reference is exactly cited.

Is there a solution?
 
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