Tygu, Enn. <br/><br/>
Knowledge_Based Programming /  

 - 1st ed /  
 - England :   Addison-Wesley Publishing Company. 
 - p243 :  
<br/><br/><label>ISBN: </label>0-201-17815-X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economics
<br/><br/><label>Dewey Class. No.: </label>BV288  / M8