Dewey decimal classification and relative index 
Devised by Melvil Dewey 
 - 20 ed. 
 - New York:  Forest Press,  1989. 
 - xx, 944p. 
<br/><br/><label>ISBN: </label>0910608393 
<br/><br/><label>Dewey Class. No.: </label>025.431  / DEO