Christopher, Ken W. <br/><br/>
DOS 4.0 reference / 
Ken W. Christopher, Jr., Barry A. Feigenbaum, Shon O. Saliga. 
 - New York :  Wiley,  c1989. 
 - viii, 216 p. :  ill. 
<br/><br/> Supplement to The new DOS 4.0 by the same authors. 
<br/><br/><label>ISBN: </label>0471506370 
<br/><br/><label>LCCN: </label>90064184     
<br/><br/><label>Subjects--Topical Terms: </label><br/>PC DOS (Computer operating system)<br/>IBM Personal System/2 (Computer system)