Duffy, Tim. <br/><br/>
Four software tools :  DOS for IBM PC and MS DOS, word processing using WordStar 5.5, spreadsheets using Lotus 1-2-3 release 2.01, database management using dBase III plus / 
Tim Duffy. 
 - 2nd ed. 
 - Belmont, Calif. :  Wadsworth,  1990. 
 - 1 v. (various pagings) :  ill. ;  28 cm. 
 - Wadsworth series in computer information systems .
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0534116760 
<br/><br/><label>LCCN: </label>89014755  
<br/><br/><label>LC Class. No.: </label>QA76.76.O63 
<br/><br/><label>Dewey Class. No.: </label>005.36