Duffy, Tim <br/><br/>
Four software tools 
Tim Duffy 
 - Concise edition 
 - Belmont, Ca.  Wadsworth Publishing Co.  1990 
 - 1 v. (various pagings) : ill. ; 26 cm. 
<br/><br/><label>ISBN: </label>0534092195 
<br/><br/><label>LCCN: </label>89-14668 
<br/><br/><label>Subjects--Topical Terms: </label><br/>PC DOS (Computer operating system)<br/>MS-DOS (Computer operating system)<br/>dBase III Plus (Computer program)