Kent, Allen Ed. <br/><br/>
Encyclopedia of Library and Information Science, Vol.50, Supplement-13 

 - New York  Marcel Dekker, INC.  1992 
 - 389p.  24 cm. 
<br/><br/><label>ISBN: </label>0824722779 
<br/><br/><label>Dewey Class. No.: </label>020.3  / ENC