Sasse, Volker. <br/><br/>
Stepping up to DR DOS 6.0 / 
Volker Sasse 
 - Germany :  Data Becker Gmbtl,  1991 
 - 251 p. :  ill. 
<br/><br/><label>ISBN: </label>1557551294 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Operating systems.<br/>DR DOS.
<br/><br/><label>LC Class. No.: </label>QA76.76.O63  / S356