PC Learning Labs teaches DOS 6 & 6.2. 

 - First Indian edition. 
 - New Delhi :  BPB,  c1995. 
 - xxxiv, 474 pages :  illustrations ;  25 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>8170296129 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Distributed operating systems (Computers).<br/>Operating systems (Computers).
<br/><br/><label>Dewey Class. No.: </label>005.44 PCL