Kent, Allen Ed. <br/><br/>
Encyclopedia of Library and Infoemation Science, Vol.49, Supplement-12 

 - New York  Marcel Dekker, INC.  1992 
 - 361p.  24 cm. 
<br/><br/><label>ISBN: </label>0824720490 
<br/><br/><label>Dewey Class. No.: </label>020.3  / ENC