Zenith Data Systems <br/><br/>
MICROSOFT MS-DOS Version 3  Program Development and Winchster Command Guide 

 - Primera Edición 
 - Michigan:  HEATH,  1986. 
 - Pag. 90  ilu., fig.  17x21 
 - Volume III .
<br/><br/> Part IV: Program Development Command Guide - Part V: Winchester Command Guide 
<br/><br/><br/>En eng 
<br/><br/><label>Dewey Class. No.: </label>001.642  / M 596