Barhudarova,S G. <br/><br/>
Орфографический Словарь русского языка:Orfograficheskiy slovar sovremennogo russkogo yazyka/Spelling Dictionary of the Modern Russian Language 

 - MOscow  Russian language  1988 
 - 398p. 
<br/><br/><label>Dewey Class. No.: </label>491.714  / BAR/O