Kent, Allen <br/><br/>
Encyclopedia of Library and Information science, Vol.57, Supplement-20 

 - New York  Marcel Dekker,INC.  1996 
 - 357p.  24 cm. 
<br/><br/><label>ISBN: </label>0824720571 
<br/><br/><label>Dewey Class. No.: </label>020.3  / ENC