Dewey, Melvil. <br/><br/>
DDC 21: Dewey Decimal Classification and Relative Index /  
by Melvil Dewey. 
 - 21st ed /  
 - New York :   Forest Press: A Division of OCLC online Computer Library Centre, Inc. ,   1997 
 - lxix, 625p :  
<br/><br/><label>ISBN: </label>0-910608-50-4 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Library Science
<br/><br/><label>Dewey Class. No.: </label>2:51M0  / N6.1