Sehgal, R L <br/><br/>
Computing and disk operating systems for librarians 
by Sehgal, R L 
 - New Delhi  Ess Ess publication  1994 
<br/><br/><label>ISBN: </label>8170001692 
<br/><br/><label>Dewey Class. No.: </label>005.4 SEH/COM