Understanding MS-DOS 
the Waite Group, Kate O'Day, John Angermeyer, Harry Henderson. 
 - 2nd ed. 
 - Carmel, Ind., USA  H.W. Sams  [1989] 
 - xii, 361 p.  ill. (some col.) 
 - Sams understanding series .
<br/><br/> Includes index. 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>MS DOS Computer file