Duffy, Tim <br/><br/>
Four software tools  with WordPerfect, VP-Planner, and dBase III Plus 
Tim Duffy 
 - Belmont, Ca.  Wadsworth Publishing Co.  1988 
 - 613 p. : ill. ; 27 cm. 
<br/><br/><label>ISBN: </label>0534088201 
<br/><br/><label>LCCN: </label>87-12510 
<br/><br/><label>Subjects--Topical Terms: </label><br/>PC DOS (Computer operating system)<br/>MS-DOS (Computer operating system)<br/>WordPerfect (Computer program)<br/>stephenson,program