Duden, Leipzig <br/><br/>
Duden  Deutsches universal worterbuches A-Z.CD-ROM, Version 2.0 
by Duden, Leipzig. 
 - Mannheim  Dudenverlag  1997 
<br/><br/> German Universal Dictionary 
<br/><br/><label>ISBN: </label>3411054794 
<br/><br/><label>Dewey Class. No.: </label>433  / N971