Zenith Data Systems <br/><br/>
MICROSOFT MS - DOS Version 3  Basic Concepts and Features 

 - Primera Edición 
 - Michigan:  HEATH,  1986. 
 - Pag. 95  ilu., fig.  17x22 
 - Volume I .
<br/><br/> Part I: Preparation Guide - II: Primary Feature Guide  
<br/><br/><br/>En eng 
<br/><br/><label>Dewey Class. No.: </label>001.642  / M 596