Extending DOS / 
edited by Ray Duncan 
 - Reading, Mass. :  Addison-Wesley,  1990 
 - 432 p. ;  23 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>0201550539 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Operating systems (Computers)<br/>MS-DOS (Computer file)<br/>PC-DOS (Computer file)