Varsegi, Alex. <br/><br/>
Fourth generation business systems / 
by Alex Varsegi. 
 - New York, N.Y. :  John Wiley & Sons,  1989. 
 - xiii, 332 p. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>047161548X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Business--Data processing.<br/>Fourth generation computers.<br/>Expert systems (Computer science).<br/>System design.