Ritchie, Colin <br/><br/>
Operating systems : incorporating UNIX and MS-DOS 
Colin Ritchie 
 - 2nd ed. 
 - New Delhi :  BPB Publications,  c1995. 
 - 232 p. :  ill. ;  28 cm. 
<br/><br/> Includes Index 
<br/><br/><label>ISBN: </label>9781858051314 8170296420 
<br/><br/><label>Subjects--Topical Terms: </label>--Computer, MIS
<br/><br/><label>Dewey Class. No.: </label>005.43 RIT