Thomas, Robert M <br/><br/>
DOS 6 and 6.2 instant reference 

 - 2nd ed 
 - New Delhi  BPB Publications  1994 
 - 346,2  Pb  18.1cm 
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>
<br/><br/><label>Dewey Class. No.: </label>005.4(DOS)