Mike  Burton,Negel Shadbolt <br/><br/>
POP II Programming For Artificial Intelligence 

 - 
 -  Addison-Wesley Publishing  1987 
 - 207 
<br/><br/>  
<br/><br/><label>ISBN: </label>0-201-18049-9 
<br/><br/><label>Dewey Class. No.: </label>004.8