Microsoft MS-DOS user's guide and reference :  for the MS-DOS operating system. 

 - [S.l.] :  Microsoft Corporation,  c1991. 
 - xiii, 668 p. :  ill. ;  23 cm. 
<br/><br/> Version 5.0.  Includes index. 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>MS-DOS (Computer file)--Handbooks, manuals, etc.
<br/><br/><label>Subjects--Topical Terms: </label><br/>Operating systems (Computers)--Handbooks, manuals, etc.